I recently got a MIM Ritchie Blackmore Stratocaster which is in essence the same as the YJM model.
Different pick-ups and no brass nut, but same axe.
They obviously make both guitars (The Blackmore and the YJM) at the same time, the same way and
just separate a batch from another at assembly.
Only a few parts make both models different. Mostly the sticker on the headstock.
I must say I am an Yngwie fanatic in every manner.
The guy plays insanely well, has tremendous control, his playing is soulful even though he plays
most of the time at breakneck speed (Which is one of the most staggering things about him) and he is
certainly an inspired and capable composer.
I don't revere everything he writes, but one has to admit he is a force of nature music-wise.
Back to the guitar:
I always wanted to own a scalloped guitar and only rarely had a chance to try one here and there too briefly.
I never has the heart to actually modify one of my guitars that way...
I finally had a chance to swap an amp against this guitar.
I can say that it feels very natural to me. No issues at all playing a scalloped fingerboard.
I guess that my technique is already balanced enough and don't press hard like I used to do in my first years of playing.
Of course, if you press hard, you will throw the pitch sharp...
...And if you press hard on a regular neck, it will only make it harder to play faster.
The actual benefits reside mostly on the easier bending and vibrato with such a neck.
I like the feel it has. It does make your fingers feel free...
But I'm so used to play regular necks, I cannot say that I play better or faster with a scalloped one.
I wouldn't go as far I scalloping other axes I own, but I do enjoy having this guitar.
On that subject though, I always wondered what was the point to only have the last 4 frets scalloped
on the Vai's guitars as he does...
Since the space between these frets is so small anyhow, your fingers cannot touch the wood.
Seems just to me a quirky feature just so you can add to the list without going through the work of scalloping whole necks.