The "spare tire" discussion is one that everyone has their point of view. You simply need to do what makes you feel comfortable when driving. The tire fix-a-flat kit in the SSR will work in cases where the tire has a small/medium leak. It won't help when there's a large hole torn into the tread/side wall.
The Toyota Sienna has this same discussion going on too. The front wheel drive Siennas come with a mini spare, but the all wheel drive does not but it does come with run flat tires. The rear drive shaft runs right through the spot where the mini spare is mounted so that is why the Sienna AWD comes with run flat tires. After getting some miles on the run flats, many of the Sienna AWD owners are finding out that the run flat tires last at most 15K to 18K miles (on the Sienna) and they're not cheap to replace.
The SSR (with run flats) would be a nice option, but as the Sienna AWD owners are finding out, it's a long term costly configuration. I drove my motorcycles without a second thought of a spare, only because there was no way to carry a spare.
A SSR with a mini spare that when inflated to a "min" level would have a similar diameter to the fronts and inflated to a "max" inflation would have a similar diameter to the rears would be a good option too. We're talking about a solution to get you off of the road and to a place that can fix your flat. My 350ZR has different sized tires on the front vs. rear but it still comes with a mini spare.
I still think the SSR should at least come with a jack/lug wrench, so you can remove the tire and take it somewhere to repair the flats that cannot be temporarily addressed by the fix-a-flat kit.
The Toyota Sienna has this same discussion going on too. The front wheel drive Siennas come with a mini spare, but the all wheel drive does not but it does come with run flat tires. The rear drive shaft runs right through the spot where the mini spare is mounted so that is why the Sienna AWD comes with run flat tires. After getting some miles on the run flats, many of the Sienna AWD owners are finding out that the run flat tires last at most 15K to 18K miles (on the Sienna) and they're not cheap to replace.
The SSR (with run flats) would be a nice option, but as the Sienna AWD owners are finding out, it's a long term costly configuration. I drove my motorcycles without a second thought of a spare, only because there was no way to carry a spare.
A SSR with a mini spare that when inflated to a "min" level would have a similar diameter to the fronts and inflated to a "max" inflation would have a similar diameter to the rears would be a good option too. We're talking about a solution to get you off of the road and to a place that can fix your flat. My 350ZR has different sized tires on the front vs. rear but it still comes with a mini spare.
I still think the SSR should at least come with a jack/lug wrench, so you can remove the tire and take it somewhere to repair the flats that cannot be temporarily addressed by the fix-a-flat kit.