Congratulations on your purchase! I bought a similar kit two months ago, a minty ProSD with 90KL, brand new 127KL, two SD backs and a minty L2 prism. I would highly recommend the adjustable grip, it makes it far far easier to hold, especially as the straps are probably the most annoying setup ever. It also gives you a much nicer grip when focusing close as the camera gets very nose heavy. I use the grip and have a BlackRapid attached to it for when I want to hang it from my shoulder. I also just bought a mint 65KL, looking forward to checking it out.
I love the SD, since buying it I haven't used my Hasselblad much, more to do with learning the beast as I do love my Hassy but it is interesting to see how each has its place.