Nothing special about fitting the Varta G14. I'll know in a couple of years if it lasts longer than the original and hopefully quite a few more after that. I think the only reason not to fit a stop/start battery is if a lessor/cheaper one does the job but being a D4, lesser ones don't seem to do the job.
Edit: Mostly this D4 does only short drives so a fast recharge battery seems appropriate.

