The reason I like the Ab Lounge is that it gives my head and neck the support I seem to require vs. doing ab exercises on a mat on the floor where I'm prone to wrongly using my head and neck to "assist." For me ab work is torturous and the Ab Lounge is the "spotter" I need to help prevent cheating.
Not sure if they're still being sold?? I would suggest the more expensive mesh fabric Ab Lounge instead of the cheaper blue canvas that I purchased, simply because I think it would be somewhat cooler (temperature-wise) to work out with. Also I listen to favorite music while using the Ab Lounge!