I'm a side sleeper and I find them great. Used them in winter camping as well. If you get the winterlite pad, it really does work without an underquilt.
If you don't want to shell out for an Amok. Hammock camping for side sleeping does work. You just don't sleep aligned in the hammock like the guideline, but rather skewed on a slight angle to create a more flat sleeping position. It takes some practice but is can work for side sleeping or even chest sleeping. You just need to find the right angle so you aren't bent.