On my SV(01' naked). I have the Sargent seat and Buell pegs. I am 6' tall and it fits me great. I have done a few 500+ mile days with no complaints. The buell pegs made a world of difference for me. Now I just need to get some heavier springs and emulators in the front, or maybe gsxr forks. The stock suspension is undersprung especially 2-up.
2-up on the SV is a little cramped for myself and the wife, and with my Cortech Sport saddlebags the wifey wont fit. The bags cover the passenger pegs. Medium length day rides might be ok 2-up but any long rides wouldnt be real comfortable. doable yes, comfy probably not.