Bought the vario 15 after using a bca last season. I like the versatility of the Vario. 15l is perfect for day tours. I carry shovel, probe, snow saw, snow study kit, cornice/rb rope, food/drink and there plenty of room if you want to put your skins in on the down or carry extra layers. Hopefully get to take the 40l attachment on a multi day trip soon. For my build (5'7" 145lb) this pack has been more comfortable compared to the bca.
Started with the Vario 30 and like it for extended trips, but found it a little bulky for quick side trips. Purchased the Vario 15 and in seconds had it on to my existing frame and it was out the door. Great pack and the weight you do not even notice after a few laps. No problem with carrying my med kit, shovel, probe, water, and a puffy.