Yes we do.
It is working fine, but I would not use one. At my age I had to purchase a lightweight bicycle, because of the hilly terrain around our city.
The reason I did this was because one day I weighed my bike and it came to 29 lbs. I thought "Oh my goodness, I've been peddling a "sack of potatoes" up those hills." I found my present bike on Craigslist, and it is a beauty - it weighs 18 lbs, and is a joy to ride (except for my wreck, which was not good - 1.5 days in ER). One day I picked up a rental bike just for fun, and I could tell it weighed over 30 lbs.---- so, no rental bike for me!.
Of course the lightweight bikes are pretty expensive, but it was worth it to me. Those hills are much easier for me, with my Roubaix Fuji with 24 speeds (and I use all of them --- but try to stay on the path!)