Hi Ross Grant,
As far as their support goes, I am not impressed. I have given up on them.
I bought the WP Rocket plugin and ran it for 2-3 months and then found the real reason why my site was such a mess. When they offered to log in and fix it I did a mock up of my site with a copy of it in a sub-domain and they worked on my dev site for about 6 weeks on and off. They then confessed that this was a known issue and that they hadn’t resolved it.
After I found a few other s2Member users that had complained a couple years ago I then decided I would tell them I was pulling the plug on my dev site as this was just more headaches to me. I asked if they wanted a copy of my site to test and they said no that they would build one. I have yet to hear from them and knowing that they knew about the problem for some time before my request, my guess is, they do not plan to fix it.
I can say I really like Comet Cache and it just works perfectly with everything I have thrown at it. It is faster than WP-Rocket and I have considered my costs for WP-Rocket a learning experience, one that I am still dealing with. I just bought 3 plugins yesterday, one I got to test, the others were a guess on if they would work or not. One of the plugins that was 40 bucks doesn’t work but the developer did track down that I have a Java error so I am hoping that they can fix it otherwise I am out another 40 dollars.
I would say just buy Comet Cache, it is totally worth it and is not a yearly fee like WP-Rocket is for their pro version.
On another note, my site now ranks better on scripts too than when I had WP-Rocket. That feature never really combined the scripts it just made it load slower.