I've had my M750 for getting on for 20yrs.
I love it.
Its certainly got a bit more oomph than the 600 and in my opinion that gives it just enough that I don't really need any more.
But its a personal preference kind of thing ... some like massive power, some are content with just enough, so whether you would like one depends on your mindset.
On the kind of roads (minor A's and B's) that I like to ride, it has enough power for me and although I'm not a superfast rider, I don't get left behind on those kind of roads.
Fast dual carriageways and motorways sees it getting a little left behind (but mostly by those who are prepared to ignore speed limits), but it is by no means out of its depth.
It does have a wet clutch but that means its a trouble free clutch. Mine has done about 35k miles with never a murmur from that dept whereas the dry clutches seem to be fairly fickle and much less long-lived. Of course you don't get the dry clutch rattle but personally I can do without that.
The engine is relatively short stroke which makes it more revvy but the good old 90 deg vee configuration means it doesn't vibe.
Most of the earlier ones came with basic equipment ... my yr 2000 (carbed) one has non-adjustable forks which are rather harsh due to being overdamped. Early 900s have the same issue though, in fact it seems to be a trend even with some later monsters.
Clutch pull was a little heavy until I fitted an aftermarket slave cyl, but now its fine.
Note that prior to about 1997/8 the engines were slightly different and had an internal clutch slave which can't be upgraded.
These earlier models generally had single front discs and also were fitted with single phase alternators while later models had twin discs up front and three phase alternators.
Easiest way to identify these early models is by the wheel spokes which get fatter towards the rim while later ones are fatter towards the hub (and a tad lighter).
There was an injection model produced for a couple of years after 2000, with an extra gear in the box (6 instead of 5) and possibly some adjustment to the front suspension as well as twin front discs and the later style rear suspension.
I'm probably biased but for me, the 750 has everything I need in a motorcycle.
And welcome along, by the way.