I've never seen those before either, but from the appearance of the tools in the ad they look to be identical except for the color of the plastic parts as those sold by places such as HF. I have some HF tools and usually they are fine for the hobbiest, but the low cost usually is achieved by using bushings instead of bearings etc. and they won't hold up well to prolonged use. I just read the fine print in the descriptions and also might well ask about bearing types if it's not shown. Really makes a difference on high speed air tools such as a die grinder. Another area they scrimp on is the quality and strength of the drive gears in the case of an angle grinder. If there is a waranty then keep your reciepts and use it, usually they'll give you another to replace yours if you have problems.