I've never been out on the water in one, but I did research that very model when shopping boats. The G3 and Xpress both made the top of my list equally. Actually the G3 had one feature that made it top the Xpress, but I could not find a new one in stock anywhere near me at the time and the used ones I found were overpriced, so I ended up getting the Xpress. Sea Ark or War Eagle would have been there but budget and availability were problems for them as well.
That one feature? The forward mounted fuel tank. Aside from that the two boats ran neck and neck feature-wise. I would, however, love to have that weight forward in the boat, but I ended up moving my TM batt's forward and got about the same end result.
The 90 ought to push that boat nicely, I've even heard it's on the verge of being too much motor for that hull. I opted for the significantly lighter weight, and cheaper, 70 and haven't regretted it, but I doubt I'd have had any problems with the 90 either.
I have two buddies that run G3's of other models and both use their boats regularly. No problems with them so far.