You say you're a car guy. Cool, but I really haven't been for most of my life, and I really am not all that knowledgeable. So, this forum has been a gold mine for me more often than once.
My experience: Two months before I took delivery, I took a
ridiculously brief test drive ... a mile, maybe less, in city traffic. I hated the transmission
! My first impulse was to cancel my reservation as soon as I got home. But, I didn't. I was convinced to take delivery mainly by reading the experiences of current owners who mostly seemed thrilled with this quirky smart. It didn't hurt that (at that time) there was a good chance I could unload it without a loss. By the end of week one of ownership, I couldn't believe what a negative impression I had from that
farce of a test drive. I never got to check out the paddles, or much of anything else. Still pisses me off to think I made a 600 mile round trip to be treated that way!!

Make sure they give you a real test drive ... or better yet, a couple of them under different conditions/roads.
As you know, it's not a sports car. BUT, it does have enough pep to be fun to drive! I've got a lead foot myself and since I'm not super obsessed with MPGs, I frequently leave the behemoths way behind when leaving a traffic light. That's a kick, but it's also a defensive move! LOL, get away from them.
Well, July 12th is my 1st anniversary! 
I'm 99% paddles and am very glad I didn't cancel. Now I find it a kick to drive! I started out mostly in "D" because most of my cars have had automatic transmissions. It didn't take long for me to realize though that the paddles were SO much more fun!