|No experience with this type of prop, but I'll be installing one in 2014.
Reverse problems may be "prop walk" related. The boat going more to one side than the other.
My shipwright said they have in the past, been known to deploy only one blade, since they are not geared.
I think the odds of this is extremely low, especially if the blades are clean. The odds are possibly the same as Charles Lindberg having his engine stop over the Atlantic in the 20s. So I would use it and enjoy the extra speed.