Yes...any instable reviews are most probably of v9. Since then it's become more stable every version. v13 is rock solid. I can't remember the last time I crashed. Hash have embraced a bug fixing policy so I can only assume it will get more stable with v14.
I would say with Maya, you would get bogged down with the interface. At 15 you just want to model and animate. AM allows you to do that. That's not to say it will be plain sailing.....3D animation is hard in any mans language.
Hash offer a 30 money back guarantee....if you're not satisfied. I believe they will replace your cd if it gets scratched for a nominal fee.
If you buy AM today, you'll get v13 on the cd. But you'll have access to all v14 downloads for a year on the Hash website. With this model, January is the best time to buy.