did blizz fix the XP off and party sync exploits?
i did a 10-19 FTP disposable roll a couple of months back, it was seriously loaded with twinks of various levels with full gems/enchants etc. ran into other disposables using BOAs and MOP vendor gear which was what i was doing, but i had no enchants. predom the twinks were 14-18, of course there was obvious 19s, they would get noticed and chatted about by levelers. i did not find this as a enjoyable option
The only issue that I have seen that can be a real detractor is Evokers Quing down to a low level. They do ridiculous dmg, but I have not seen it often. Also, they are made out of wet tissue so my rouge was not really having any problems w them. Even with the issues that you will run into with playing a BoA disposable, I guarantee that it's a much better experience than what happens @ 20.