For an SUV it's very good with plenty of space unless you have a family or carrying more than 5 people, then some issues arise. The third row isn't exactly spacious and kids will fight for the mid row to avoid the third. Gas mileage is self explinatory since it runs on a V8. Power is plenty when you need it on highways and even after years, the GX is still fairly quiet even with a V8. All in all, it is a great SUV, just be prepared for gas trips and the questionable third row.
The GPS and extra electronics make this SUV even more comfortable. The resale value is also fairly high for this SUV as opposed to others which is also another plus.
Just drive more gentely on this SUV if you want to save gas is all and a family of six is probably the maximum if you are looking fo an SUV such as this anymore and I suggest looking for a van.