Hi L'escargot,
If you can, try one for a week. Or even once. I've been cycling competitively for 5 years now and the only time I've had back problems was after I used a recumbent bike to exercise on regularly when I was stuck in Phoenix for 4 months.
I think there's actually very little benefit to using them if you're not going to go flat out (you burn more calories and stretch muscles more by walking or swimming), and you get a REALLY sweaty back.
The only real advantage of using the gym was that I found my Polar HRM linked to the machines so I could work consistently at 85% max heart rate. But that has the disadvantage of really confusing the poor sod next to you who is strolling along and whose machine is receiving data from your HRM. Ahem. Sorry, whoever you are, since you looked a bit concerned when the machine told you to "stop immediately".
Dave.
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