Other than the obvious health ones I find it such a buzz wearing clothes that were a bit tight before and now finding them quite loose.
I would have to say though the best one is fitting into my car I have an old Ford XF Sedan and it was getting to be a tight sueeze behind the wheel.
My husband had to put in new seats as the springs were worn out and that made it even worse. I couldn't even reach the hand brake or adjust the radio without having to undo the seatbelt and I could barely touch the pedels.
Now I have to move the seat forward and there's heaps of room. I can also get into the backseat of a car now and not die of embaressment because I can't get the seatbelt done up.