I bought a Hummingbird and learned to fly it first. It really wasen't that hard.
I had a Nexus in my workshop for almost a year, but was to chicken to give it a try.
After flying the Hummingbird I decided to finish the Nexus and give it a go.
The Nexus is SO much eiesier to fly than the Hummingbird.

I think the small electrics are ok to learn on just because they are inexpensive to buy as well as replace parts.
If you can fly one, then you'll have no problem with a larger machine.

Warren

PS Don't bother trying to fly a micro helicopter in even the slightest breeze. Thats when you start buying parts ;-)