My observation "chattering" when the unit slows down:
This is because the motors feature an electric brake which brings the unit to a slower speed or a stop much more quickly than simply freewheeling. It is intended to be a safety device, such that if you are drilling and bump yourself or someone else, you can limit injury by bringing to a stop more quickly rather than letting it freewheel until normal friction takes its course, or if you are drilling a precision hole or driving a screw into soft material, the drill will slow down more quickly than older models. The review I read on here where the user complained about the chattering didn't bother to read the specs nor the manual, otherwise he would have known it is normal operation and does not indicate a faulty motor, but an operational brake.
The pros:
BHP452 Drill
The BHP452 1/2" drill is solidly built and the transmission has a very clear detent when switching between clutched screwdriver, hammer drill, and drill modes. Contrary to what many have told me about Makita tools, construction quality seems to have improved since the early '90s; It does take two hands to shift modes but I consider this a pro, and is no different than having to use both hands to adjust the clutch on my older Makita drills.
Not counting the battery pack, the BHP452 is actually as compact as my smaller 9.6V makita drill and is about the same weight as either of my old drills. What makes this surprising is that the new drill is so much more powerful than my old 6095D drill. I found it was possible to stall the old drills by grabbing on to the chuck even in low speed/high torque mode. I cannot make the BHP452 stall even in high speed/low torque mode at half speed. This drill is rated at 450 in-lbs, or 37.5 ft-lbs of torque, which is enough for all but the largest hole-cutting jobs. I have only had a few opportunities to use it so far but it held up on a single charge for an hour of steady intermittent use, and when I put the battery on the charger, it was topped up within 5 minutes.
Sound level between the BHP452 and the 5095D is very comparable - within 2 dB on a sound meter at equivalent distance. The apparent loudness is slightly higher for the BHP452, but it's due to the higher pitch.
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