I can't give you a personal experience yet since I'm just inbound the process of setting my system up! But, several months ago, I was researching controllers like crazy. My searching resulted in me finding no complaints Abbott the GHL systems and do many problems with the Apex... so, I ordered the GHL Profilux 4 system... still in the box right now, lol. But, one thing I liked was that its almost all in one controller... no need for all those additional modules that Apex ends up making you buy to do the same thing. Plus, those already using the GHL who have also used Apex in the past prefer the GHL system. Another plus is the ease of usr of programming the GHL which uses drop down menus where Apex requires actual writing lines of code. The GHL cones with the 4 major probes as well. One downside I see array though is the GHL only had 6 outlets on their power bar where I believe Apex has 8. Definitely worth the time to look into the GHL system.