I saw the beta in ft lauderdale this weekend. This was the white beta from the Detroit auto show. Here's my observations:
Exterior really is as attractive at it seems online. Wheels were gorgeous and though large, the proportions are lovely.
Interior was a very mixed bag. The touch screen is less of an issue as far as dash integration than I thought looking at photos online. I can see getting used to it quickly and the display itself is very readable. Seats were acceptable but almost no side support- that could certainly be improved for a car that is supposedly fast and has sharp handling. I had no issues with vent placement but there were some serios usability issues. The armrest and cup holder seem like they were designed by someone who never sat in the car. A major fail. The doors had not even a slim pocket for papers or whatever. And there is a definite need for some sort of closed storage lest that "purse tray" becomes an auto junk bucket. Where I live - south Florida- I always have a drink and a sunglasses case at the ready. In this interior there's no place for a drink that you can reach and only the floor for glasses as the glovebox is un reachable for the driver. I wont even mention the pens, change, and other junk that require a home. Trunk storage is great and fit and finish looked decent, although there were a few glue spots visible.
Although a tesla employee there would not say much about changes that may be forthcoming, he did make a point of saying that the interior on this car was a months old design and did not necessarily reflect post Fremont ride event feedback. One certainly hopes so as this level of usefulness in a $100,000 car (signature) is a significant failure to date. The tesla guy also said that a lot of controls would also involve voice integration and steering wheel control, which, if well implemented would improve usability of the screen by a large margin. He also hinted that there were a few features/benefits for signature that remain undisclosed.
Bottom line: I'm dying for a test drive and love the "idea" of the car even at a premium price, but the interior needs work for me to sign on the dotted line. Hopefully there's a version 2.0 version of the interior waiting to be disclosed.