I have started an experiment similar to Mark's with albuterol. My dosage is half of his, it may have something to do with the difference in size, I am fairly small.
Either way, much like Mark, I have noticed a few differences. We are not talking about miracles or anything like that, but there are some positive developments. The biggest thing I have noticed is that when I ride my exercise bike at night I no longer need to support my legs to avoid that they "flap" out to the side. I feel that my feet shuffle less when I walk, and I have an increase in physical energy.
All of this could be a placebo effect, I am very good at setting myself up for failure, but whatever it is, I will take it is long as it lasts!