Prevost will tell us that the first slides were a disaster,since about the 04 shell slides there have been very few problems,and the newest slides which have no pins are very good.I heard a Prevost rep say that the first slides almost broke Prevost.I have the latest slides and they are very smooth operating in and out,because of the way I use my coach I really need slides and I really like the additional space.Jon,you are right about the bay space being different but I rearranged all my stuff and it all fits in the bays,I am not sure that the space is smaller but just different.Also Jon I agree with you that the shell might be comprised with slides installed,I think that only Prevost slides are designed correctly,I would not consider slides by Featherlite,Valid or any other supplier because I don't believe that the engineering by others is equal to Prevost.