Side sleeper here, and I really feel it in at the hips and knees without the right pad.
I cant use CCF pads anymore. I was using a Thermorest Prolite Plus (the 1 1/2" one) and it worked very well, no complaints. I switched to a POE Elite AC to save some bulk and weight and its been working great so far. Much lighter than the Thermorest at 11.5 oz (on my postal scale, regular length pad) including the sack and patch kit, The trade off is that I'm more paranoid about it puncturing, as it feels pretty thin. No problems so far though and I find the POE to be close to the same comfort level as the Thermorest.
Someone posted about their arm going numb when sleeping on their side. My arm goes numb too if I sleep with my head on my brachael artery, which my head naturally falls on when I fold my upper arm under my head. I have to make a conscious effort not to do that, and to sleep with only my hand under whatever I'm using as a pillow.