I would whole heartedly suggest the Spitfire. I own one and love it! I also own a Solitare lookalike from Sportsmans Guide. Here's the scenario that sold me on the Spitfire.

You've been hiking all day and 30 minutes before you reach camp it starts raining. The Spitfire and Solitare both set up fast and easy...but the real problem comes when you go to enter your retreat from the rain. The Solitare basically forces you to get the entire insides of you shelter dirty, wet and muddy, while the Spitfire comes with a rainfly that has a vestibule..you can sit inside and leave your muddy feet out, not possible with the Solitare unless you bring a tarp and hang it up as well to create a vestibule.

Just my two cents worth, but the Spitfire is hands down better and not the much heavier.

One drawback that I will mention is that the poles on the Spitfire are longer and have a funky shape that doesn't pack down real small....but once set up, it beats the crap out of the Solitare in my book.