I have a set of the Tubbs altitudes as well as some redfeather shoes for my wife.
Generally, they're not too bad (the Tubbs)...for recreational...let's not have our lives on the line shoes; however, the simple, solid design of the MSR binding system makes it easy to work with gloves and a heavy pack on. The fact that the MSRs base doesn't have an outer edge with a flexible inner piece means that branches, etc. don't get stuck between them. The long side "crampons" are excellent for side hills, and the toe/instep crampons work very well for going up and down steep slopes.
Just to let you know...I use the MSRs exclusively for Mountain Rescue. I can't afford to have a binding system break or come off, or not be able to be worked with heavy mountaineering gloves on....issues I experienced with the Tubbs. We also are very hard on equipment. It has to go above and beyond what the normal user will do to it.
I won't recommend any other shoe for anyone who is going to do anything serious.
-H-