I had been wanting an extra bag for a while now to carry all my Glow discs. Play every week, sometimes 2-3x week and it eventually gets old taking out all my daytime discs and inserting all my Glow discs, then doing the opposite a day later. Finally decided to get my Bender on and add another Grip bag, picked up the Gray/Black C15 this weekend.
I absolutely love my C14 but as asc349 pointed out there were some very minor tweaks added to make this about the perfect bag. The larger water bottle holders are plus and the higher D-ring towel clips are a welcomed edition. As stated the side pockets could be a tad larger to make them more accessible but the flap covers are a nice edition for bad weather. Lastly the velcro strap management system is a nice touch, had previously used electrical tape to manage the extra strap lengths to avoid stepping on them.
Glad to be done with buying bags hopefully forever, these two should last me a long time and take care of all my DG needs.