It's like a different car. Much nicer ride, tyre noise reduced. Handling characteristics are slightly 'different' but not better or worse IMO.
I keep a compressor and a can of water based tyre goo in my boot. That said, I have BMW Assist and rarely stray too far out of my county so it's all a risk assessment really. You may decide the trade offs in practicality aren't worth it without a spare in the boot (literally in the boot - it won't fit under the boot floor).