Not really. Shimano SL-BS50 (NOT the SL-BS50-8, be careful when buying online) are the indexed 7 speed model and are still pretty easy to come by. Since the front is friction it doesn't matter what front derailleur/chainring combo you run. Use them on dirt drops, flipped albatross or northroad bars and you're good to go. As for rear indexing, if you run 8 cogs from a 9 speed on a 7 speed freehub, you should hit all 8 just fine with a 9 speed shifter. Changing out a freehub is a serious pita, and respacing/redishing add to the time and expense. I hope this helps in your decision.