depends on which mini you mean
This mini-tri isn't that small -- small field or gymnasium, for sure, but I'd be nervous about this guy in a living room
I also haven't figured out the Yaw mechanism yet (having touble getting his design to mesh with my parts-on-hand) so it's still a "work in progress". Nice design, though. Sadly it's motors were coopted for another project . . . so it'll be a while before it's up and flying . . .
http://forum.flitetest.com/showthread.php?6099-Tricopter-made-in-Austria
This nano-quad is RTF, but for the cost ($40US) it flys *really* well and I've had fun flights in 10x10' rooms (3mx3m) without fear of getting hit -- a great quad to fly inside and hone sklis. The downside -- any air conditioning currents will carry it away
My understanding it's being sold over in the EU under the name "Hubsan Q4", and the controler's firmware is a touch more flexable than the US version(D/R, flight modes, autoflips). That being said, the stock controler is *tiny* as well, and hard to use becasue of it, however larger sized Hubsan controlers will bind with it and aren't to hard to find under $20, if you can wait for the shipping.
http://forum.flitetest.com/showthread.php?6497-PROTO-X-The-Ultimate-Whipper-Snapper