My Zeus kit came in a few weeks ago and has been great. I'm very pleased with it. I read somewhere that they say it can be run un-boosted without issue, but no experience with that personally.

I still plan to go with the Forbyn kit for my next build though. I was also thinking of using their hydro boost brake master system to possibly avoid cutting the wing. I'm going to be running power steering so tee-ing in a line won't be a big deal. http://www.forbynbros.com/seriesdefe...boost-adapter/

Running without a booster is an interesting idea. I know my 74 MGBGT has an unboosted master and it came stock with disc front, drum rear. So those systems do exist.