I have two, a Q320 and a Q120.
The Q320 is connected to Natural Gas and is my go to for quick mid week cookups it's also the only Weber BBQ I have bought new and was also the start of my obsession with weber products
The Q120, I like to take camping or to the park/picnics
The Q is a very versatile grill and apart from low and slow cooking there's not much you can't do with it. Most cooks are easily adaptable from the kettle to the Q as far as setting up for indirect cooking
It's also been webers biggest seller in OZ since it's release about 10yrs ago and has won many awards for it's design.
It has a lot of similarities to a kettle as in it's easy to clean, pull apart and replace parts
And like a kettle is pretty much indestructible with it's alloy body and plastic tables and stands
I like the fact that Weber OZ is still innovating new accessories for the Q and only wish they would do the same for the kettle like they did in the 80's
I think the price point for a Q has really helped with sales too
The Q120 retails for $285
Q220 retails for $385
Q320 retails for $699
That probably seems expensive for you Yanks but it's well priced for the Aussie market