My boat came with a Boomkicker solid vang. Essentially, you keep the old vang in place and simply install the Boomkicker. The previous owner used the Boomkicker AND a topping lift. I removed the topping lift since it was unnecessary. It's worked well for me.
Practical Sailor magazine did a review of solid vangs. May 15, 1999. Here's what they said: "Overall, we remain convinced that, ignoring price, Hall Spar's Quick Vang is the best all-around vang." Naturally, there was more said about the collection reviewed. Check it out.