I love these! They make a great snack, and before I got pregnant I'd sometimes have one as a breakfast replacement. I'll probably load back up on them once it's safe for me to cut calories again.
I personally don't mind that some have sucralose, but if you do, read those labels! I especially like the chocolate chip cookie dough and the cinnamon roll varieties, and have been wanting to try the two new flavors.
Besides GNC, you might want to check out your local nutrition/health stores; I've been able to get good deals sometimes with the manager if I buy them by the dozen. One of my local gyms has a little nutrition shop inside and sells them too (although they're more expensive there than GNC).