It’s not a massive cost/change if you were buying a whole brand new bike anyway. I’m getting my first full suss in a month or so which will have 27.5″ wheels and it’s costing me the same as it would have to buy the previous year’s version with 26″ wheels.
I’ve had a test ride of a very blingy carbon Santa Cruz Solo on 27.5″ wheels and it felt great compared to my bike, which is hardly surprising considering the difference in frame and spec, but I couldn’t notice any specific difference due to the very slightly larger wheels.
The wheel size thing isn’t worth getting your knickers in a twist, wheels are still round and bikes are still bikes.