I just literally setup my new Apex (Lite) yesterday. It's smooth and easy to program and assemble.
I really like the web interface for setup and programming. The programming language is simple, and there are a ton of examples out there to use. The iPhone App is sweet as well. And the display head unit has the best look on the market I think if you're going to have it in an everyday visible area (mine is Velcro'ed to my hood).
I ordered the Lite regular priced for $339 USD as an Xmas present to myself from my wife
I will soon be adding the Vortech WXM module ($120) so that I can control my Vortechs. Then I'll be adding another vortech after that.
The Full Apex can control Tunze with the cables I believe. But because I don't use anything variable and have no interest in monitoring ORP, I decided to go for the cheaper Lite version (exact same but missing ORP and variable ports). Hopefully I don't kick myself for not getting variable ports if I ever go LED.
Cheers.