FLEX 24V Brushless 4-1/2 in./5 in. Angle Grinder vs Makita 4-1/2 in. / 5 in. Angle Grinder (Corded or XGT 40V)

Multiple Reddit users — including FLEX owners — admit the FLEX is the least comfortable grinder they've used. On a drill or saw, ergonomics are a preference. On a grinder you're holding at awkward angles for extended sessions, bad ergonomics become a safety issue as fatigue sets in. The Makita is specifically called out by welders for feeling like a 'finely tuned race car' — it fits the hand, the trigger is intuitive, and you're not fighting the tool.

The FLEX wins on peak power — it's harder to stall and hits harder on initial contact. But the Makita XGT 40V is built for sustained heavy grinding without fade, which is what fabricators actually need. Stall resistance on a quick cut matters less than consistent torque through a long bead grind. These tools are optimized for different power profiles, and which one matters depends entirely on your use case.

FLEX users aren't complaining about battery life in a vacuum — they're buying multiple packs and rotating them to keep working. That's a workflow tax and an upfront cost that doesn't show up in the tool's sticker price. The Makita XGT 40V is more efficient under load, which means fewer interruptions on a job site. If you're doing a full day of grinding, the FLEX will have you swapping batteries; the Makita won't.

The FLEX is a Lowe's exclusive, which means your battery investment is stranded if you want to expand your tool lineup beyond what Lowe's carries. The Makita XGT 40V has the same problem in reverse — those 40V batteries don't cross-pollinate with Makita's massive 18V LXT ecosystem, so existing Makita users aren't getting a free ride. Both tools ask you to commit to a platform. The Makita platform is deeper and more established; the FLEX platform is more limited but the grinder itself punches above its weight.