9.7 just arrived a little bit ago.
Having only played it a little bit so far, I'll probably need more time with it to really see the differences between it and the original version...it's got the same cheesy themes (not necessarily a bad thing), same slightly "zoomed-out" table view (I prefer Necro's closer view, but not a huge deal), and same view-blocking "announcements" (something Necro fixed, I'm disappointed they didn't do that here). The default high scores are indeed a ways higher than the original (between 3 and 4 billion, compared to a half billion in the original), but unfortunately it still only saves one high score per table instead of 5, another thing Necro addressed.
I've only spent a little time on each table, but offhand it seemed to me that the center ramp on "Gladiators" and the lock hole on "Knight of the Rose" were trickier to hit than before, although the ramp seemed easier to get onto in the latter, as well as the extra ball holes in each. "Dragon Showdown" is still a pain, though I managed to hit the round hole for the first time in memory (yay!): "Warlock" overall seemed a bit more forgiving (no more instantly losing all your multiballs down the out lane, at least), which opens it up to possibly becoming my favorite table of the set (though "Dreamlands" from Necro is probably still my overall favorite). On that note, I wasn't aware that there was a Necro demo on 9.7...sort of an odd choice to include, seeing as it was released the year before 9.7 came out.
Anyways, I'll keep plugging away at it, and hopefully getting more used to it (looks like I'm not going to be able to milk "Black Knight" as easily as I used to, however, heh heh)...it was probably a good thing I sprung for the deal, since P-A is apparently out of stock of the game now (I may well have gotten the only one they had left). I was also surprised to see it come in an "oversized" CD case, and with a HUGE instruction manual (especially after the almost nonexistent one included with Necro), it looks nice in my Saturn lineup though, heh heh. More impressions (and hopefully some decent scores) to come...