4-1/2", 6 amp angle grinder, HF #65519 - Pass.
I've been looking for another angle grinder to go with my Dewalt DW402. It gets real old changing back and forth between grinding discs, flap wheel and wire wheels. I decided to get one of these on Saturday. On Sunday I used it off and on for about 4 hours on a welding project grinding welds and chamfering steel. While not an extensive test, it worked just fine and felt about the same as my Dewalt. The paddle switch is nice too. It has a small lock lever on it that prevents the grinding from turning on if laid down on the paddle. Something the Dewalt does not have. Definitely makes it safer.
One thing I've learned abouy HF power tools. Its a good idea to run them on and off with no load for 5 - 10 minutes before use. I think this helps the bearings and gears get broken in and seated before they are put under a load. Every tool I've done this on has continued to work just fine.