Do you have the regular or the Large/XL? I saw those before but wasn't sure how well they would work with the roll a cot. Great to hear it works well...might have to find a deal on that tent.I have used my Rol-a-cot with a tent for a couple years and it is THE WAY TO GO. I have been in heavy bugs and heave rain and I have never had a problem.
The tent I use and it is awesome is the thermarest cot tent. It is made to be on one of their cots. I would not use their cot but on a rol-a-cot it is bad ass.
It is the answer you are looking for. I have tested it and love it.
That said...it doesn't seem all that different from many 1 person tents that are cheaper. Mostly just the fly not being as extensive. This alps one looks reasonable...
Part of me is kind of tempted to get a single wall tent like the Black Diamond...but there isn't one that would be perfect for a cot tent and they are way expensive.