I have made the transition from a Calmato to a pattern flying plane as well, in this case the Protech Tojeiro, which is somewhat like the Oxalys, though i guess the latter is even better.

It sure is a do-able transition, though you MUST really be able with your Calmato, which does have self-righting capacities.. the fact that you haven't noticed the latter, might be an indication that it's too soon.

However, the Oxalys is a F3A airplane and as far as I understand those aren't that evil.

Are you flying your calmato with maximum control throws? It should do a full roll in about 2 seconds then. Can you fly it inverted? Knife-Edge? Slow rolls?

If you're confident and you do master the calmato, i would say go for it. It's a whole new world with these airplanes, especially when it comes to things like knife edge. Take it easy on the control throws in the beginning (set them to the recommended or even less) and set some expo on all channels. Then you should be ok.

All in all.. though an F3A plane wasn't exactly my 2nd airplane, it was my 2nd 'serious' glow-powered airplane, and i've had no problemsn, other than the Tojeiro coming apart during flight, which is not a pilot error (didn't happen because of crazy flying, was doing an immelman at the time and the wing-bolt-mounting plate just broke free).