For that price, I would be worried about the quality of the components - the bearings may not be much good, likewise the rails. You may have problems with the RAMPS board (cheap chinese boards have known problems with low quality MOSFETs driving the heated bed - although this kit doesn't seem to have a heated bed). The hot end will most likely have jamming or feed problems. I'm not fond of the acrylic frame myself, as they can crack.

If you source the parts yourself, you can be reasonably certain of the quality. Spending a reasonable amount on a decent hot end, for example, will save you loads of problems down the road. If you take a look at Amazon or ebay, you can find electronics packages, vitamin (nuts and bolts) packages and a frame for a reasonable price. You can always buy the nuts and bolts from your local hardware store, so long as you can find reasonable quality stainless steel.