i was looking at that too. First thing I would check out is that it actually punches correctly sized holes. I got their hydraulic crimper (for around $36 after sale and a coupon) and while the crimper frame is actually pretty good, the dies are all wacky. the 4awg die has about a 3/16 hes hole in it..
i would get the HF ko set, use a 20% off coupon, and hope it lasts long enough to make $800 with it which I would use to purchase a greenlee.
I would also obfuscate the fact its a harbor freight crimper by removing the labels, ditching the case and carrying the pieces in a tool bag, lest a customer (or worse, another trade) sees me using harborfreight tools.