Product review (5 stars): Tips from a veteran...
I HIGHLY recommend using Orangatang Stimulus 70mm 86a dura wheels (the yellow ones). I don't know much about longboard wheels, but I've found these to be much better than the stock ones, and much better than other wheels I've tried.  Larger wheels for speed (and cracks) and harder for acceleration. The stock wheels are just too small. Also, know that you will have to replace the wheels relatively frequently if you use them a lot, because the motion wares them down pretty quickly. I'd say a few months of heavy usage would ware them down to the point where they don't ride well anymore. I've had my skates for over 2 years and I still love them. It's not hard for me to go up hills anymore. I can basically ride them downtown anywhere. Once you get the hang of them, you can maneuver through people and around cracks/rocks. It takes quite a bit of time to master them though. It was probably 6 months before I could go up any decent sized hill. I can now clock about 30 mph on them though, so it's worth the effort. Really fun to ride. Don't buy their wheels or grip tape. I just got a roll of sandpaper and cut out some shapes lol.