Rotary Fly Tying Vises

I have been fly fishing for about a year and am thinking of trying tying.
I saw some videos on the Nor-Vise rotating vise system and it looked very
interesting. A couple of questions:

For those experienced tyers out there, is having the ability to rotate the
hook as useful as it appears to a novice?

What are the downsides? One thing I thought of is with the bobbin on the
stand and the hook rotating to add body materials, the thread will twist,
is this an issue?

Are there other rotating vise systems out there in addition to the one from
Nor-Vise tha I should consider?

Thanks for any insights that you can offer.

Jim