I've never had 750 either, I've heard it's very reliable for road use but heavy for offroad handling though possible if you look like a norwegian logger or Arnold Schwarzeneger.
The 750 is said to be an excellent touring machine, but thirsty.
My best advice for you if you want a great multi use bike is: buy the 3AJ from 89&+ you won't be disapointed, cause when taking a close look at all the improvements/caracteristics of this model you'll understand the ambition of the great Yamaha engineers of eliminating the sensible points and making a reliable work horse.
Also, the long travel suspension is practical for offroad use.
Excellent maniability on road and well positioned center of gravity...today I just made a painfull experience of a highly stressfull urgency handling and the bike saved me from falling, a driver was throwing his car in front me..suddenly when steering away I was heading against a 15-20 cm high trotoir and on it there was a metallic road sign, so when hitting the trotoir I had to turn right and in 70 Km/h this made the bike behave like a snake crawling fastly forward; lost control.
My top case almost touched the ground as I steered away from the road sign, suddenly I opened the throttle and hold steadily the steering....and this excellent bike raised up instead of falling, taking control again.
Me I'm happy with it.

Cheers,

Matt