Im sure better answers will come ( you may read the linked threads below as they go into a lot more detail)
I use the HC1 , have used the FX 1 and so far used Premium tapes with both with good results
I understand that because of the way HDV is compressed to fit onto DV tape, the HD tapes are formulated to minimise drop outs ( amongst many other factors)
As such they are recomended for HDV recording.
However, there is also the advise not to mix tape types ( this is especially true of HD tape)
So If you start with HD tape it may mean reusing them to save cost
Or risk using them for Very impt events and stick with Premium for day to day use.
I would personally not even bother with them
see these previous thread on the same topic
Which mini DV Tapes for HDV recording Sony HC3E - DV or HDV tapes?