I had a 94 classic with the tourpack, sold it got a 06 police e-glide and I miss my tourpack. I ride solo all the time right now because we have to small kids and still miss the tourpack. It is so nice having that extra space.
I ride solo nearly all the time - she has her own - and my '07 RG had the detachable system. I found that I never took it off. Nice to be able to stow helmets when we stop for lunch.
Why would I want to remove the tourpak - love the extra storage & the rear speakers - no plans on removing the tourpak, ride solo 90 - 95% of the time!