I'd caution against the Clarke (Machine Mart) one. TopCat had one, we used it to run a nut down a threaded bar to try and seat a bush (or something similar, can't remember) .. OK, that isn't really what it's intended for, but it's duty cycle must be pretty damn low 'cos after a couple of minutes work the trigger burned out. Not just the trigger but the wiring and the motor!
It also only barely undid a steel wheel nut that was at correct torque. I'm not sure it would have coped with all four.
OK, it was well used and quite old, but tc always had two batteries with it, cycled them and used it correctly but even so, it wasn't that impressive to me!
I'd guess that the price, against a Milwaukee, means for a DIY er it looks good, but it really is a DIY, occasional use, piece of kit.