Depending on your intended use the EOTech is an excellent option. As mentioned the mount is integral, and so is the Aluminum protective hood. The 512 and 552 series both use AA batteries so it won't cost you a fortune to replace them like the C123 lithiums or the N cells.
I've mounted mine directly to the receiver. Intensity adjustments cover all conditions including clear sunny days and low light with no washout or flaring issues. I believe there are 22 daylight settings and 5 night vision settings(for the 552 model which will work with night vision monoculars).
Going price on a NON NV AA battery model(512) is around $450 give or take. The ACOG(which is really nice) will run you $1300 and up depending on model and where you get it.
For shooting inside 200 the EOTech works well. Don't expect to print tight groups, that's not what it was intended for. However, I have no issues hitting a 12"X12" steel plate offhand at 200 yards.
TDC
ETA: I love my EOTech and wouldn't run anything else for a non magnified optic.