Keep in mind Guarder clears tear very, very easily - the also do not work well in conjuction with Madbull Python inner barrels due to the diameter of the inner barrel itself.
I find the Guarder Black rubber works better than the clear.
I've always followed Amos' & Thundercactus' pushing of ARS rubbers - they're phenomenal and I always acheive the best results paired with an SCS nub. I also like the stock ICS rubber and swear by that too.
Prometheus also just released some new products i'm fairly excited and curious about see this thread - and thanks to Stealth (are you ears burning?) he should be getting this or something similar in very soon.
http://airsoftcanada.com/showthread.php?t=146131
Edit: SHITBALLS! I just noticed he got them in stock - payday is friday boo
