This is pretty well off topic, but I think y'all can help...
My eight year old daughter spends part of her day in a wheelchair, (she can walk, but a metabolic muscle disease leaves her exhausted if she overdoes it).
Insurance recently paid for a new wheelchair. It is titanium and super-nice. The only problem is that they outfitted it with tires that contain plastic pellets instead of standard pneumatic tires. My wife, basically relaying what the wheelchair rep had told her, said these tires would be just as comfortable as inflatables without the maintenance.
So I hopped in the chair and took it for a spin. What a crock! It feels like the chair is riding on the rims. You can feel every crack and pebble. I told my wife that we needed to pop those tires off, take out the pellets and put in tubes. She will have none of it. She likes the "no maintenance" part of it. I just really think it will make a huge difference in comfort. My daughter is seems to be fine with it either way, but I think she'll change her tune if she has to spend an extended time in the chair.
If anyone has any selling points, besides the comfort, (since my wife thinks these tires will be just as comfortable), please let me them pass them on.