I really don't think the small improvement is worth the additional cost, unless of course you've got another rifle that needs glass.
The scope you have, has a very good reputation and I actually like the simplicity of the G2B (although I DO like the Bushnell G3).
Don't get me wrong, there is a noticeable improvement in the glass, but that is all. Especially if you take the time to change the oring in the turret caps and lube them with silicone spray. (much improved turret feel).
Are you going to sell your Burris to fund the new glass?
If not, like I said, it is tough to move that way for such a small improvement.
Just my .02, FWIW, I have an LRTSi and it is a dandy scope and it IS better than the Burris 3-15 I use.