Other 100cm guns I have used include; Spetton Velos, Omer Excalibur, Picasso Hunter, Totemsub Pelagos, Rob Allen (Aluminium and carbon) Cressi Comanche, Spetton ALS, Seatec Albatross,Beuchat Mundial, Sporasub Viper, Rabitech stealth, C4 monoscocca.
I find the Gabbiano suits me best (although the Totemsub and the C4 are very close behind) Most of it comes down to personal preference, whether the handle feels right in your hand etc. At the end of the day, the diver is far more important than the gun!
cheers
dave
www.spearo.co.uk