You would be safer keeping them in terrariums to begin with but some are not mini or dwarf once they start growing.

I got a 'Shamus' from them a year to a year and a half ago and it has spread nearly two foot on a table in my living room. The glass table top is 20" in diameter

Here it is in April this year.
{{gwi:436535}}

And in June this year.
{{gwi:436536}}

Hoo boy, Butch, that's a purty Shamus! Mine was doing very well (at least I thought so 'til I saw those pictures!) but I grow most my begonias outside, and I've been having problems this year with a grasshopper-type thing that eats great pieces out of some of them, and also some chiritas. Things tend to do better outside with all the humidity--until the bugs get to work. Ah well--they're basically healthy and will come back. sigh

but I got too carried away with Shamus-- Some of the little ones from Rob stay pretty small, and some need terrariums, but not all. It would help if you told us what you got.

The ones I got are:

Black Fang
Red Eye
Minni Merry
Dainty Lady
China Doll
Last Laugh
Little keepsake
Madame Butterfly
Goemetry
Luzonensis
bowerae higramarga
Winky's Chocolate Chip
Five 'n Dime

They are all so cute. I got the mini and dwarf specials where they pick the plants. I really like them and hope to be able to care for them properly.