I order a LOT online, since "shopping" is practically unheard of in this area. When anyone sends me a conf. email with a suggestion to feedback, I DO SO IMMEDIATELY. It's VERY important for those who use online shops to be able to give back a definite idea about what was good, what wasn't; what was easy, what was abysmally difficult; and what would make our "shopping trips" easier, more fun, and more fulfilling.
Go for it! AND btw, WHAT are you selling?