Will be setting up a demo of Veeam B&R soon but wanted to put the feelers out incase someone had a similar setup to mine that can vouce for speed , reliability and my thinking

Currently I have a vmware 4.1 farm consisting or around 25 HP BL465c G7 blades fully populated (24cores) attached to a F-Class 3PAR storage system hosting around 450 windows vm's mix of Exchange, SQL,Citrix VDI's, DC's & F&P.
I have a 100Mbit connection to our dedicated DR site which comprises of roughly 9 HP G6 blades and a HP 6400EVA.
Ideally i would like to replicate around 20 of my core VM's which is around 40TB's in total of which possibly 200GB changes on a daily basis.
Currently we use a product called doubletake to replicate a couple of DC's, exchange boxes, SQL cluster etc etc, but this product has never been used in anger so is untested.
I've a couple of questions.
Firstly has anyone else out there got a similare setup working with veeam successfully.? If so what have been your thoughts on the whole process and have there been any issues.?
Secondly - even though i only want to replicate 20ish of my vm's i assume i still have to purchase a licence for each socket in my HP cluster.?
Thanks in advance for any thoughts, posts etc.