Had a makita which jammed to much which put me off makitas, not saying there all bad. Tried senco battery and corded, don't like the depth stop on them. Changes with pressure too inconsistent for me and the nose doesn't have enough surface area or it's too much pressure is needed, even with the 75mm attachment on the ds275 or 3000 it leaves a depression i don't like. Had hilti sf4oo0 and something, corded with smi 55 loved it, now got hilti sd5200 corded with smd attachment, great consistent depth stop, not much of a depression off the nose, light, not much pressure needed and rarely jams. Looking for a 240 as i need some versatility, need a few guns on the go and need some to move around, different properties and upstairs so don't want to be lugging transormers around and running leads upstairs. more leads to carry in, unwind,wind up and take out so looking for some 240 screwguns on circuit breakers. Not keen on the batteries, having several batteries on the go and chargers can get confusing when busy and a pain moving them around, plugging in and unplugging several times a day eats up time and i find they've not got the power of corded.
Looking at the bosch gsr 6 45 with ma55 attachment and concept autofeed. Bosch has 700 watt input motor, max 55 mm screw with bottom loading screws making it easier to get into the corners, looks smooth but more than twice the price of the concept which looks like it may need more pressure but hard to tell from a video and it has top loading screws which seem to load slightly smoother but cant get close in on internal corners but will take up to 75mm with extra attachment, lot cheaper than bosch, only got a 470 watt motor and haven't found torque figures as the unloaded spin speed is the same but torque can vary significantly depending on efficiency of the motor, or so i've read. Anyone tried either the bosch or concept?