I think all the comstar redesigns are, across the board, much better than the original art. However, not all of them are as distinctive as the original art. The Guillotine's shoulder pads and searchlight made it easily identifiable, while the new one look more like it is related to an Awesome. The Flashman was one of the egg-bros, and pretty easy to identify because of that. The new versions of these two mechs are not as instantly recognizable, but they are still better and less cartoonish than the original art in my mind.
The Crab is still pretty distinctive, but I think the major issue I have with it is the angle of the arms. I don't like the arms hanging down from the shoulders. I prefer the older look where the arms came out of the side and were almost parallel to the ground. It made it look more like a crab and less like a Linebacker with weird hands. The shape of the arms are good, but they should be elbows-out not elbows-down, if that makes any sense.
The lancelot and mongoose are just plain better, although I think the Mongoose Gunslinger is still my favorite Mongoose.