They work well, but if your looking for possible problems here's the heads up.

1) It can be picky with chargers and cables. So sometimes it wants something different from what you might use from your phone.

2) It uses 2 MicroSD cards. One for the operating system and one you can use for just games. The cards they offer you though might have a low life-span so you might want to back up the files just in case.

3) It can come with games, but the ROM files they use might be poor or mixed with Chinese ROMs. Though if you have your own ROM collection you could always use your own.