If you're already in the Milwaukee M18 ecosystem, this is a no-brainer. Even if you're not, the brushless motor and paddle switch alone justify the investment, this is the grinder tradespeople actually reach for.
What holds up
Brushless motor delivers more power and longer runtime than brushed alternatives
Paddle switch design improves safety, grinder stops if dropped
Compatible with entire M18 battery ecosystem (drills, saws, vacuums)
Frequently available as a kit with 5.0Ah battery and charger for ~$199
What to know
Cordless means battery dependency, heavy grinding drains batteries fast
Kit price (~$199-$389) is higher than budget corded options
Heavier than corded grinders of similar disc size
Expert verdict
Milwaukee M18 18-Volt Lithium-Ion Brushless Cordless 4-1/2 in./5 in. Grinder with Paddle Switch with 5.0Ah Starter Kit $199, 48% off
The FLEX grinder has a cult following on Reddit for good reason, users who've owned both say it flat-out outperforms Milwaukee in power and smoothness. The battery drain is real, but if you keep spares rotating, this is the most capable cordless grinder you can buy.
What holds up
Variable voltage allows use as grinder, cutter, and polisher
Community consensus: more powerful than Milwaukee and Ryobi cordless grinders
Vibration dampening built in for reduced fatigue
Compatible dust extraction wheel cover for vacuum hookup
What to know
Eats through batteries faster than competitors, need multiple on rotation
Ergonomics criticized by some users as less comfortable than Milwaukee paddle switch
Lowe's exclusive ecosystem limits battery sharing with other brands
From the community
I've used Milwaukee and Ryobi too model 4.5" grinders and the Flex breasts them by a long shot a lot more power and way more difficult to stall
I got one 2-3 years ago, I do tile work by trade and everyday I abuse it. The only thing is it does go through batteries but good thing I took advantage and got some batteries and tools.
Welders on Reddit consistently reach for Makita when precision and comfort matter. The XGT 40V is the cordless grinder to get if you're doing real fab work, it won't stall where Milwaukee hesitates.
What holds up
Superior ergonomics and trigger response vs Milwaukee, comes on instantly, stops on a dime
40V XGT platform delivers heavy-duty corded-equivalent power
Preferred by welders and fabricators for sustained grinding sessions
Wide accessory ecosystem including dedicated cutting, grinding, and wire wheel setups
What to know
40V XGT batteries are not cross-compatible with standard 18V LXT tools
Higher price point for XGT platform entry
Some reported QC inconsistencies in older models (pre-2022)
From the community
Makita tools feel like a finely tuned race car, vs a lumbering, but powerful, land yacht. They come on instantly, and stop on a dime.
Both the Milwaukee M18 FUEL paddle switch and Makita XGT 40V slide switch I have used feel far more comfortable in my hand. The Flex one is a beast as far as power goes, though
For anyone who doesn't need to move around a job site, a corded DeWalt grinder is the smart buy. You get full power all day, no battery management, and DeWalt's proven durability, all for under $60.
What holds up
Consistent full power with no battery drain concerns
Lower upfront cost than cordless equivalents
DeWalt's corded tools have strong long-term reliability reputation
Ideal for stationary workshop use: grinding, cutting, wire wheel work
What to know
Cord limits mobility on large job sites or outdoor projects
No battery ecosystem benefit, can't share power with cordless tools
Corded grinders require nearby outlet or extension cord management
From the community
Any real grinding is corded, I've relegated the cordless to flap wheel work.
I didn't buy it when you can get a corded one for 49. If you're not going to be bringing it to diff work sites and need cordless there's no reason to overspend
Bosch doesn't get the Reddit hype that Milwaukee does, but among tile setters and concrete workers it's the quiet favorite. The power delivery is smoother than DeWalt for sustained masonry grinding, and the ergonomics are genuinely better.
What holds up
Smooth, consistent power delivery ideal for concrete and masonry grinding
Strong ergonomics praised by tradespeople for sustained use
Bosch's corded tools have excellent long-term reliability track record
5-inch disc size offers more cutting depth than 4.5-inch for concrete work
What to know
Bosch cordless ecosystem (18V) has fewer specialty tools than Milwaukee or DeWalt
Less brand recognition in North America means fewer local service centers
Corded only in most recommended configurations
From the community
Bosch, between Makita and DeWalt in terms of price/durability/ergonomics
I agree with Bosch for drills, but the problem with Bosch is, at least in Vancouver BC, they don't have the same accessories (vacuums, lights, lasers, sanders etc) as Milwaukee and DeWalt.
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