I was considering going this route for my Maggiolina Airlander Medium. I then took measurements and found that the full size mattress from Ikea fits perfectly. One night on it and it is great. Just sharing this info for those looking for a replacement. Price was right too at $120.
Just got an email saying my mattress is shipping today. So far, I have had great communication and experience. Hope it continues with the delivered product! I'll post back, for sure.
^ I also have the Exped Duo Megamat for our Kodiak tent in addition to the MegaMat 10. The Duo is every bit as comfy as the 10. The only downside: When your SO moves or gets in/out of "bed" you will feel it and visa-versa. But I still sleep the best on my Expeds of ANY other mattress I've used and owned. Its just as comfy as our Serta iComfort home mattress.
I bought the Duo to try in my small width Columbus thinking it might squeeze in the smaller width but it was a no go; if Exped offered a 46-48" wide version it would be perfect.