I really enjoy using FunnelFlux. I've been using a self-hosted installation for over 7 months. I wasn't really confident with the installation process when I started, but I got in touch with support with a few questions and instead of just answering them they just went ahead and installed it for me. I recently created a managed account after FunnelFlux V2 was released with a new improved database and I'm in the process of migrating over the campaigns from my self-hosted installation, but I'm already enjoying how much faster my reports are generating.
My main reason for using FunnelFlux is the visual funnel builder. I love this feature because I'm a very visual person and I like to see the traffic flows in my funnel. This has really made a difference for me when I'm setting up complex conversion flows and when I get an idea of how to route different traffic segments for different reasons - I can just jump into the visual flow and move it and reshape it all on one canvas.
Otherwise, I've always received fantastic support from the FF support team, even with technical issues that don't directly relate to the tracker - for example, I was experimenting with collecting my own push subscribers at one stage and couldn't work out how to integrate the register callback API with FF so I reached out to their support as a last resort and they came back to me with a while bunch of ideas and custom JS code that I could experiment with.
I really think this is a great tracker and it's loaded with complex technical features. It took a minute to get used to the dashboard and UI because it's different to other trackers, but once I got my head around it I found that I could set up new campaigns in next to no time.