Regarding Enigma Protector Professional for developer

I'm interesting in licensing features of the Enigma Protector. What I need - short registration keys, because I will have to deliver license key for my users by mobile - SMS. I've just seen AsProtect also, but it's registration keys are long enough and not suitable for sms delivering.

I compared Enigma Protector with Armadillo Software Passport, but for now stopped attention on the first one, because it is cheaper than Armadillo and there is no unpacking tools and tutorials like for Armadillo. Armadillo also does not support .net application protecting, which I plan to release.

I just curious, who use Enigma Protector, is there any specifics?

Anyone can share valuable comment. I am waiting.

I test demo from enigma site:
http://enigmaprotector.com/en/home.html