I have an XPS 3-0 on my 10.5" AR.
Great sight for quick target aquisition, but IMO it is not a long range sight. Up to 50 yards it's great, out at 100 yards it's not the best. Perhaps it's my old eyes!!!
As mentioned above, "built like a tank", and recoil will not be an issue!
An Eotech (red dot) is just an aiming device/sight, which does not have any sort of BDC system, so it can be mounted on any caliber, zeroed it at a given range, and you're good to go!
My XPS runs on Lithium 123 batteries, the same battery I use in my Surefires. Eotech claim 600 hrs use per single battery. I purchase the 123's from my Surfire dealer for less than $2.00 each, much less than the N battery. Also, the XPS models are much more compact than the ones that use AA's.