You
do not have to buy JVCs tapes . I have a knockabout JVC miniDV camcorder which (along with 2 other Sony HDV camcorders), I use the
Sony Premium tapes with.
Never had any problems with them
Offers seem to be on that tape from time to time at Amazon ( a recent thread on that
Here)
Incidentally I have used JVC tapes with no problems but I don't think any of the brands is special even though I have mainly used the Sony tapes for more than 5 years
What I would advise against is mixing tape brands ( and types) as it used to be a rather fast way of permanently damaging your camcorders tape head.
I suspect it is not so much of a problem now but I wouldn't personally want to find out.. the hard way
Buy whichever you wish .. and as much as possible stick with it