I've had my white Roadster for about a year and a half. It does get a lot of attention, and it's almost entirely positive. Some people have no idea what it is, and others are excited to see a Tesla, but almost everybody seems to love it.
When I borrowed a Model S for a week and a half, it was a more stealthy car, not noticed by as many people. A few of the people who did notice it, however, were a bit aggressive. When I was picking up the car, some guy blew diesel smoke from his truck at me. A couple of others seemed like they wanted to race me.
The only negatives that have ever come up in conversation about my Roadster were just in the last couple of weeks. "Oh Tesla, those are the cars that had all the crashes!" And, "Yours isn't one with the Autopilot? I bet they aren't going to make any more of those, haha!"