I see my reputation precedes me!
Disadvantages: Cost, cost, and, erm cost. Also, if my experiences are anything to go by your paint bill will sky-rocket. Hopefully you play on a team who shares the bill at the end of the day
Advantages: easy to time - just plug into your pc and set each aspect of the firing cycle (eg bolt open time, time bolt stays open etc., etc). You thought your cocker was fast already? Wrong!
Also - no matter which cack-handed friend uses your marker - he'll never be able to short stroke it!
In all honesty, a blade frame is just as fast, maybe faster, due to it being not limited by the electronics.
For the 1st 30 seconds of the game anyways. You get the old problem of tiring fingers on mechanical triggers, which is gone on the race frame.
I notice your location is quite close to Pompey Rob, if ya want to pop down one evening/weekend afternoon to see one in person then drop me an email via the link in my profile on here and we can hook up sometime. I'm currently trying to get an air fill for my new geddon, but if it comes down to it I can hook up a housemates reg and bottom line and run it CO2.