I love my 16T. I do mostly commuting and endurance riding, and the boost in fuel mileage and the more 'relaxed' rpm's are great. I don't really notice a difference in off-the-line power, and I can still out-accelerate most cagers. I did a bit of light off road riding yesterday, and I did notice that I had to rev the engine a bit more to avoid lugging the engine in the dirt and sand that I was in, but again, this isn't much of a problem for me as I don't do a lot of off-road riding.
If you want to try out a 16T sprocket, then go ahead and buy one as they are not that expensive. If you find that you don't like it, let me know and I will buy it from you to keep as a spare for when my current one wears out.