RE: zen 50
Interesting..you have both the 90 and the 120.
I have the Zen 90 still in a box, building an Excelleron 90 right now.
I think the retracts scared me a bit so I opted for the Excelleron 90 for now, will probably proceed with the Zen 90 this winter, that way I will have two 90 size pattern planes. I have a used OS 91 that I will probably use on the Zen, using an Evolution 100 on the Excelleron.
I've been flying the Venus 40 for a while, Tiger 60 before that.
DS.