Just because I like to complicate matters I went the other way and changed my order to a CT 26. I recently bought a Bosch Glide Mitre Saw that I will also use with the new vac.
I would advise to get the Bluetooth control module + remote for it if budget allows for the CT26.
You will only realize how useful and indispensable that little thing is once you have used it ...
CT15 is great value, but with no Bluetooth, no stand, no Systainer stacking and not manual filter clean, etc. it is geared more to the "dedicated static vac for a Mittresaw/worktable/etc." where those features would be wasted. It is a good value as a secondary semi-static vac. But would not go for it for a "do-it-all" main vac role.