I really like the new build (531) but I still think Klingons are a tad too powerful. Now that they have Disruptors tracking much better at warp (a good thing) this really keeps warping down in the game. As a matter of fact, a lot of changes have really helped out bring down warping and really rely more on impulse speeds (this is a good thing). But I don't like the fact that Triple fire is in the game. I wish their was some way too turn if off if you don't want it. It can be very unbalancing and only favors ships with Legendary Tactical officers, which in my opinion results in picking Tactical officers too much.
As for the Klingons, I think they are a little better now. I've noticed that Klingon players are staying away from "Zip" ships and focusing on heavy sheilds and armor. I don't have a problem that Klingon Armor is strong, but the sheilds could be a tad too powerful. I think Taldren could reduce their strenght by 10 to 15%, it would help out a great deal too balance the Klingons. Also, I'm not sure if they were changed or not, but I think Ion Cannons should take 3 turns too rearm instead of 2. This would give more reliance on Polaron and K-Photons more.