I keep my manual chair for the unexpected and it has come in handy many times.

Mine is a Quickie Breezy (the names are so lame! pun intended ), it's 17lbs. and I can still hurl it into the car when needed. When I could ambulate it under my own power, it was easy to use because it has flip-up armrests that get out of my way for wheeling. I always wore bike gloves as they're great for braking.

The only thing about the light-weights is how delicate the alignment can be. It comes with the tools and I store them inside the zipped cover of my accessory cushion. Which brings me to item #2:

If you expect to be seated for extended periods in the chair, tell them at the fitting so they can help you choose a good cushion to add to it. That will make a serious difference in your comfort level, also the height adjustment between foot paddles and seat. The downside, more junk to manage!