Jim, what model do you have? There's a big price difference between AD 6 and 2, trying to figure out which is more durable as I'm 6'3 287. Also did you change the seat out, model I tried was very uncomfortable. Thanks for your time.
I'm 6'2"/260 and have been using the 2 for a couple of months. If price was no issue I would have gone with the 6, but I really like the AD2. It is durable, effective and comfortable to use except for the original seat which was very uncomfortable. I bought a gel cover online, found the best spot and it's not an issue.
I used an old shit airdyne from craigslist worked just fine.
I don't use any of those kinds - i have an AD4. Only one I've used so only one I can recommend.