blave
I can reccomend the Enstrom against the R22, I paid the same money for mine with relativly low hours (1100) as I would have paid for the R22 and although it is a 1983 machine, age dosn't seem to matter as much as hours. The other big benefit is that all I have to do is replace a few bits every now and then rather than have a full factory overhaul at god only knows how much cost.
On a practical point of view, the Enstrom is a lot bigger and really can take 3 people (not all my size though!) and will take off ok on a hot day with me at 240lbs and a similar pax and we can put a bag in the back, and with the high inercia rotors, it is a lot safer.
Personally, I think it's a fallicy that the Robbo is cheaper to operate, I looked very carefully and I can't see where the savings are and IMHO there was no choice.