I've heard about some bad experiences from cruiser customizing, but I have purchased a lot of stuff from them without a lot of problems. Once in a while I'll order an item that takes too long for them to get, and when I contact their customer service, I just cancel that item and get it from somewhere else. They are always responsive, accommodating and friendly. Their prices are among the best, and their shipping rates are reasonable. I've always received my stuff in a timely manner and in great condition. So far, I've found no reason not to purchase from them in the future.
Scootworks is also great.