Not my cup of tea. Not being able to use the plane of my choice was a game changer for me. And I spent $300 virtual money on a plane I didn't want or need just by clicking on an icon to see what it was. Now I can say 'been there, done that'. Tried to contact them by email and got a missing .dll error. Now I really am done.
I've been messing with them as well. I was annoyed at first as well, that the trips seemed too structured, I couldn't choose my own routes or planes... then I figured out how you can. In their "Blue Box" acars software, there's a check box near the top left labeled "charter flight". Tick that, then you can choose any departure location and destination you want, flown in any plane you can choose from their menu. Admittedly that's not quite the same as choosing ANY plane you want, but there are entries in there for everything I fly, or close enough anyway. (Beaver, super cub, DC3). I just pick an entry that's close to what I'm going to use. I figure if they really care, they can deny the pirep, cause I surely don't care that much lol... But it hasn't been a problem.
I've been working my way through one of their tours as well, the short fields in a DC3 one. Doing that led me to Manfred Jahn's freeware C47/DC3 and man, what a beautiful piece of work it is. The new high def vintage virtual cockpit they're about to release for it is amazing, puts every payware DC3 to shame (even the currently available version does that, it just has a more modern cockpit). That tour uses a lot of RTTM scenery.
My only gripes with them, really, are that not ALL of the RTTM scenery locations are available in their system, though most are. And there's no real instructions I've found on how to use their site and system. I've been using their "destinations" link to see if where I want to go is available before trying to set it up in Blue Box. And Blue Box itself is glitchy for me - it likes to lock up when I send a pirep, but the report gets sent anyway, haven't had one lost yet.
So anyway, it's been kind of fun, adds a little extra dimension to this stuff, once you figure out the system.