We (wife and I) almost bought an SRT, owned a '14 5.7 Hemi Grand Cherokee for about a year, and currently have a '14 V6 Grand Cherokee.
First of all, you are either trolling or insane if you are getting the wife an SRT. Lol. If you are just insane, here's my personal experience:
There is no way in hell you will ever get the advertised fuel economy out of any of them. The V6 currently gets an average of about 18mpg. The V8 was about 16mpg.
The SRT is fun to drive fast and not too fun going to the grocery store. It steers like a dump truck at low speeds and you can feel the tires hit grain of sand though the steering wheel and suspension. This is great feedback if you are flying but annoying for a daily driver. Looks great and has a great interior.
I was racing an SRT in my 5.7 GC and the SRT pulled away pretty quickly. The "small" Hemi is fun and will light up all four tires if you try.
I'd highly recommend an Overland or Summit over the SRT for a daily driver.
Both Hemi's make great power with a nice feel. The transmissions are wonderful and "Sport" and "Track" mode actually do something. The Overland/Summit in sport mode is very fun to drive with aggressive engine braking and increased throttle response. The SRT (not sure if all years have it) in track mode is sick. Both of the V8's tick like hell and kind of scare me from a reliability point of view.
I'm a GM guy and they have really fallen short in this category.
Compared to an H2/H3, I don't like the seating position in any of the Grand Cherokees and for some reason I tend hit my head when getting in them. I'm only 5'8"
Just my .02 for free.
