I acquired my Roadster via their "lease until you buy a Model S" program. I started off really enjoying the R, and thought I may find it hard to give it up. I was considering keeping both, but ultimately I decided to trade it back in. This thread leads me to believe I made the right choice.
The Roadster excels at pure fun, but it fails at many of the other important duties of a car. I really enjoyed driving it with the top down, but you can't take a call in the car like that. Even with the top up, there was so much wind noise that I could barely hear my phone or the stereo (unless it was turned up very loud). I am actually concerned for my hearing, because the volume needed to hear the radio at highway speeds is painful when I slow down (off the highway). For a silent engine, I am disappointed at just how loud that car is. The R also fails with its A/C. Here in Houston, we can only drive with the top down between Oct to March... and the summer is uncomfortable. When the temp reaches 100F (which it does daily from June to Aug), the A/C gets diverted to the battery making the passengers uncomfortable. The Model S fixes that issue with the second A/C unit. All the rest of my complaints with the R are with the fact the the R is a sports car... so they aren't "real" complaints, just an observation that a sports car is not practical for when you need a different class of car... like a sedan. If I kept the R, I'd probably drive it 7 days out of the year. So, those 7 days, I'll deeply miss the R, but the Model S will be much more practical for me.
When I called to ask how I turn in my R for the end of lease, they said, "Hmmm, no one else has done that, I'll have to check that for you."