Question [Q] Cheap Bluetooth Keyboards on eBay

There's a heap of cheap ($20) Bluetooth keyboards on eBay, all look to come from the same model and factory so some no-brand things. Anyone know if these could be ok to use? Beats the $200+ that Nokia was demanding last time I checked about two years ago. I know for $20 I can't go wrong but I'd still rather spend that $20 on a meal if these things are junk. Check out eBay and let me know what you think. They claim to work with PS3 gaming consoles too so could be extremely handy to have around if they actually work and the batteries don't explode in my lap.
Google Nexus 4 - Rooted / Cyanogen
Nexus 10 - Stock (Root + Cyanogen pending)