Bang, several points have been made as to why Cell-Tech sucks. Like Kabuki said, insulin spiking, in general, is not a good idea. It is recommended to intake anywhere from a 3:1 to 1:1 ratio of high glycemic carbohydrates to protein (personally, I believe protein is too commonly overdosed, but 1:1 has worked for me, too) within 30 minutes of your workout, then again (in a meal) approximately 2 hours after your workoutl; however, as Kabuki pointed out, there are 75 grams of sugar in each serving, and studies haven't revealed any increase in absorption beyond 30 grams of added dextrose to your 5g of creatine. Why would you spike your insulin that much more heavily for no proven increase in gains? This is a formula for Type II Diabetes. So make sure you don't spike any more than is necessary, and eat low-glycemic carbohydrates the rest of the day- especially preworkout.
Then, as Gsoares pointed out, the price on this creatine is ridiculous, and although this wouldn't be an issue if there was no alternative, virtually every 2nd, 3rd, or 4th generation creatine on the market is an alternative- a superior one- and for much cheaper. Also, I don't know if you like the taste (since that only matters to you), but we tend to generalize in here because many guys are asking before buying, and despite all the sugar, many in here have agreed that Cell-Tech tastes like shit.
You've seen more gains than with "regular" creatines? You need to be more specific. If you're comparing to regular creatine monohydrate, yeah, you probably have. But buy your Creapure from Optimum and your dextrose from NOW, and voila, you have a superior mixture for probably around 1/5-1/6 the price.