Don't know about the belt sander, but I have bought two sets of their HSS drill sets, one for the workshop and one for the toolbox, and I cannot say I have found anything wrong with them.
Bought them some four years ago, broke some of the smaller ones [it happens ], still using the rest, just touch them up from time to time. OK for the price.
Bought one of their 4 1/2" angle grinders about 14 years ago, still using that !