If you've never owned a na six Porsche, you'll love the 718 and there are those who love it anyway in comparison. There is no discernible turbo lag but neither is there any mpg improvement despite the published figures when you drive it anywhere near normally in real world driving. It's much better than the 987 and 981 in every respect though -- styling, looks, interior, technology, pcm, engine, power, torque, handling, brakes, etc.
Except soundtrack, which with the best will in the world is diametrically different. There are many who say it makes no difference to them or isn't important. Probably less of an issue in a cayman than an open top boxster!. There are a few who say it sounds better but they're either deluding themselves or just being plain ludicrous. Or perhaps they do like it because it sounds rougher and more aggressive, like a Subaru or souped up old rear engine air cooled VW beetle (bug). The sound is not necessarily bad but many of us loved that old whine at gear change and higher revs. But if you've never known it, you won't miss it.
I went from a 987, 981 and 718 to a 991.2 Carrera now because I missed it. Although a turbo six, as opposed to na, the sound is more familiar, not quite as good as the previous na 991.1 but good enough, mainly because it's still a six with two small turbos rather than a four with a single big one. The 718S has a bigger turbo and I think vibrates more and doesn't sound as good as a base 718. My 911 is very nice, but less fun and more a GT than sports car, and I would still trade back to a 718 in a flash if and when they bring out a GT4 or some similar six cylinder version.
