Hi diverellis,
Both of them are members here which means I think very highly of their products and their customer service.
Rocky Mountain has always provided high quality service to their and have always had great good feedback over the years here and elsewhere. A forum search on Rocky Mountain will bring up many posts that mention them although a lot of them are questions about their mattresses.
You can read more about some of the issues that Select Foam experienced for a short time in post #2 here and the posts it links to but all the recent forum feedback indicates that these are resolved and in the past and the recent feedback has been very good (and the owner has left customer service to his staff :))
I personally wouldn’t hesitate to make a purchase from either of them (or any of the members here for that matter) as long as they meet your personal value equation.
Final choices are always difficult but you are in a much better position than the majority of consumers who often end up making final choices between “not so good and worse”.
Phoenix