I wear some of the jerseys as under-layers when it's cold. The cut isn't great and I find it is generally a bit baggy, but it serves a purpose and works sufficiently as layers underneath a higher quality jersey. They might look a bit odd as your only upper layer due to the odd sizing/cut etc, but it would work fine.
I've also tried the tights/longs, which I found to be a much better fit than the jerseys, although the padding isn't anything to write home about. Alright when worn with a pair of quality shorts.
The stuff I've used seems to have lasted fine, although you get what you pay for, and I'm sure it'll wear out before my much higher quality club jersey for example. If you're strapped for cash it will work fine, but you might be better off buying something like DHB kit from
Wiggle.