there not to bad, I bought one 2 years ago, and it lasted me about 8 months before the screen no longer folded in and out properly, it would fold out when i started the car, then fold itself back in, or it would get stuck, it ate one of my favourite CD's and it ended up out the window on the hume hwy.
you get what you pay for, i suggest saving your money, these days you can get something decent from a trusted brand, with a warranty for 700+ so I suggest saving your money, especially if you have a nice car for it to go in