Really good for the price. I'm an Electrical Engineer myself and I work with UAV's and 3D printers.
Sure it's not the best quality printer but you can't do better for the price and the video instructions made it no more difficult than putting together a Lego Technix set. In my opinion it's the same quality as a $1000 pre-built printer that you can buy from a Retail shop.
I cable tied mine on an MDF wooden base to stiffen the frame up, I've made a few more mods too to stiffen things up.
The acrylic frame is solid but very brittle, absolutely DO NOT use loctite as it will shatter the acrylic badly!
My printer now has about 200hours of non-stop printer under it's belt and the only failure has been the heated bed.
The prints are pretty good, not anywhere near the Ultimaker 2's quality but still impressive given the price tag. I'd rate the printing at a little less quality than an Up Mini, but has so much more potential to be a lot better!