The anniversary models are lovely yes. Disappointed with the power?
No i think not!. My 2015 4/4 has clocked up 2500 miles now and is plenty fast enough. The car is light which really is a bonus when it comes to handling and its performance is not far behind the plus 4 as a result. Its great fun to drive and a superb drivers cars - i traded my M3W for it as funds would not allow both and don't regret it at all.
Go try one - you'll love it.
My trouble would be which colour to pick - the saxe blue looks better in the flesh than in pics to me, but the 2 tone green is lovely too, but so is the red! oh choices.....