I actually like the rather laid back attitude, but then I find car dealership people irritating at best.
Lets face it in this day and age you have to offer as low a price as possible to even get a start on negotiation or at least that's how I work.
For instance a few weeks back I test drove a very nice BMW M3 it was up for £33K and was worth it. I said to the guy any negotiation on price and I think because I was there in the showroom he said about £300. So I politely said thank you for the test drive and left, I followed it up the next day with another very courteous e-mail thanking them for the test drive etc and offering £30K for a cash sale. He then phoned me and said if I could do the deal that day he would accept the offer. Now I dithered because there were other cars I wanted to check out so asked if I could think it over. Two days later he sold the car, so I guess there is a moral there somewhere.
Although I didn't hear back from the Lexus dealership where I tried the RCF I did get a decent discount on the one I've just bought. I think you have to be polite but firm and make it clear you will buy straight away if the price is right.