A comment
There are perfs "sharpened" only for light operations. Praised by consultants of supermarkets of the Baikal instrument, the E-119AT PRE of these. I took it myself, I use it without complaints. Satisfies the performance, the ability to hammer for a long time without overheating, the resistance of the case to loads. There were no repairs, only the replacement of nozzles, which are gradually dull.
He advised his brother, who works in the repair team. Tired of listening to complaints. Bought, drilled one or two, had to strengthen the mount. At a fast pace, he struck the wall, the gearbox flew. Lubricant, whatever you choose, cokes after a week or two of use, because the shock absorber is always out of breath. In general, professionals will not do.
pros
power, high-quality cooling system, durability, low need for repair.
Minuses
unsuitability for professional work (weak fixation of working elements, sensitivity to load, dampness).