Monoprice is very hit or miss. I buy all my Ethernet cables from there, never had a problem. I have a gig switch I got that is every bit as good as the name brand one I replaced with it (needed more ports - the 8 port Monoprice one was LESS than I paid for the 4 port name brand one). Data transfer rates, all else being equal as possible (not super scientific, but the only variable easy to control was swapping the switch, same cables, same computers with the same ethernet chipsets) actually went up a tiny bit. I've picked up a few other things over the years, but some of their things, especially now that they have branched out and have a wider range of products, seem kind of dodgy. If I had a ned for a drawing interface, I'd probably give the Monoprice one a try, but I wouldn't be using it professionally. I've done that sort of thing before, if I am unsure of how much I will actually use something, I will get a cheaper one to see if I really need it. If so, I'll use it until the limitations hold me back and I'll get a good one, if not, well, it's not a whole lot of money wasted.
Wacom is the most recognized brand for a reason though. For professional use it's not like you have time to dick around with a cheap knockoff only to end u buying a Wacom anyway.