I just picked up a 2015 Beta 300 as well and have to agree it feels a lot like the 2010-2011 GG until you're rolling. On the move the bike is sleeker and noticably lighter in the front requiring a little more seat movement to bite. The seat is more flat front to rear and allows quick movement in the saddle, but it's hard as a rock compared to my GGs. No suspension work yet but going to replace the Sachs forks with TTX or KYBs (have both) as I didn't get the race edition with Zokes.
I'll be selling 2 of my 2011s on here soon but no way I can part with my 250 or the Nambotin 300 right now. No wife, just a supportive girlfriend with a shoe addiction, so it's ok.