They are "prettier" than a Holley, after that the reviews are mixed. Some hate them and a few swear by them.
Like a Holley they are not an out of the box answer to whatever ails you.
More money for the same carb is my thoughts. Just put a 830 Holley race carb on my brothers 351. Nice working carb, some shooter changes and up the jets a few sizes and he ran his best number yet at our home track. Small motor likes the annular boosters. He was the only car hooking all weekend, carb made it a little softer leaving without bogging.