I've been frustrated searching high and low to have a second one. I purchased the first one at a dept store several yes ago. Didn't think I would like the firm version but after several sleeps I adjusted. Still plan to order another one and it will be medium density.
Ordered a firm and med density both very similar and it's difficult to tell the difference. Both my wife and I really love them. Liked them so much I ordered 4 more in the med density version for the guest bedroom. Hugh variation in density in the next 4 we received. Very soft, had to send them all back. I would stick with the firm if you are not sure.
I have had this pillow for over a year now and let me tell you it is so good I'm on here today to buy 2 more for my bed (I like lots of pillows) and my friend wants one for his bed too. When I have company over they always ask about the pillows. This pillow is just as fluffy as the day I got it. Medium is good for a side sleeper. It doesn't have a lot of give so be sure to pay attention to the density because Firm would have been to intense for a side sleeper or stomach sleeper. It fits perfect in my King size pillow case and the standard fits perfect in my daughters standard case.
Both my husband and I found the firmness of this follow painful. You definitely cannot sleep on your back with this pillow and I think it's even to firm for your side. I'm going to order another soft one as I do like the type of pillow.