I think its pretty quick compared to some of the other Tier 2's but beside it not being particularly good I'll probably keep it anyway simply because its a premium.
On another note I gave in and bought a little gold so I could convert the exp from my elite tanks (13.000 odd worth) so I went a little mad and researched a bunch of stuff for my US TD's as well as hitting up the German tank tree and getting my hands on a bunch of light tanks like the PzIII and the luchs (which is awesome fun).
Here are the fruits of my labor and even though they where both loses (due to my team all dying or letting the enemy cap) I still gave the other teams a real headache.
I also just unlocked the leopard but I've yet to try it out.