I have some foam tires. I have Nu-techs on one bike. They are "mushy", and the material feels softer than the Amerityres. For a pedal bike that sits around a lot, they are perfect, and they corner predictably. I have them on my wife's friction drive bike. They slip some with the roller drive, but she is lazy about bikes and won't let me put regular tires back on it. It gets the job done, goes about 20mph.
I like Amerityres a lot, and if I didn't have a stack of standard tires from over the years, I'd get some more.
I have an Amerityre BMX tread 26x1.95 tire (lost one from my truck). It rolls very well with no noticeable resistance compared to a regular tire of same size, and feels a lot like a standard tire. I'd run them on a motor bicycle. My mb rims are too wide for them though. Unlike a pneumatic tire you can just air up to fit, the foam tires come in specific widths and you can only use them on the correct size rims. I used one on a aluminum double wall mtn bike rim for a while, on a mtb, and it worked very well (front with shock).
I got mine from
www.noflattires.net, but their website is gone now, and the phone number is irrelevant now (i just called it, said I had wrong number).
Do NOT order from airfreetires.com . They are rude and SLOWWWWWWW, and do not answer their phones for customer service.
Try
http://www.amerityre.com/ and call them for a distributor with good ratings.