The control panel (for whatever it's worth)
Myself
Any downsides - if the server sucked somehow, if the fact that you have to use FTP sucked... I'm trying to be honest about the faults here.
While my service really doesn't have a lot right now, if it takes off I will be adding these widely wanted features - web based add-on management, web based pref control, web based whatever considering you all love that so much for some reason. (I honestly don't understand what is so unappealing about a simplistic server - the server looks almost like it's on your own machine. Regardless, you guys want web interfaces, so I'll make a web interface.)
If the service gets off the ground, I'll put up a poll about what people want me to give priority to working on, and then I'll honor it. That's the biggest guarantee you guys get by paying - continued development. There is no incentive other than the goodness of their hearts for Hammerhost and CBMHost to keep expanding or changing. Another benefit people get by choosing LugHost is that they're keeping options on the playing field - what happens when Hammerhost and CBMHost hit capacity? LugHost will never hit capacity by design. It can grow easily on a client-by-client basis.
I don't know what else to tell you guys. If you have a little faith in me, I can bring you the things you guys really want.