well ill be darned. they must have just done that(in the last few days) probably to stop the confusion over wow and premium. now premiums are called wows. good move by V4L.
ive used both for awhile now, and the coolcarts stay cooler (hence the name

)
i dont know how long your getting out of the wows, (i used to get 4 refills before they were un-usable) im going on 2 weeks with the same coolcart and it still works like it was new. i put about 3ml through it a day. i wont use the wows(formerly called premiums) at all now.