I have used then for ten years on e bikes. They weigh 60% less than lead acid. The only downside is their cold weather performance. They don't charge well below 32. I was going to put them in my motorhome, but battery people told me not to.
Very flat voltage profile and much lighter than lead acid ... i have been using them for years on my weather station and portable ham radio operations ... as stated above, they should not be charged when they are below freezing as it will permanently damage them