I've never used beer yeast for cider or mead... I know I've seen people posting up about using it, but don't recall if it's with issues or reporting good things. Since I can't recall, it must not be with issues, or too many of them.
My batch of hard cider that I pitched the 71B into last night was going active this morning (was post lag before I went to bed, about 6-7 hours after pitching the yeast) and is in full swing as of when I got home tonight. A good layer of bubbles on top of the must, with the airlock venting a nice amount of CO2 (and some apple aroma too).
For this batch, I simply poured the 1/2 gallon bottles of Mott's Natural apple juice into the carboy, through the funnel, getting good/decent aeration with it (wish I had my O2 system here for this). I then poured the heated/cooled mixture of 1/2 gallon cider and 1/2 gallon apple juice that I added the ~2# dememera sugar to, along with some cinnamon sticks. Pitched the rehydrated yeast into the must, gave it a few second swirl and set it aside (where it will stay for the duration). I have just 4 gallons in the 5 gallon carboy, so plenty of head space. Plus, with how Lalvin strains typically ferment, you don't normally need to worry about blow-off tubes.

I expect to enjoy the K1V batch. I make it a point to always have at least a few packets of Lalvin yeast in the fridge at all times. You never know when you'll happen upon something that you want to ferment. :rockin: Being able to make something at the drop of the hat is priceless.