Thanks for the replies.
Colin. From what you say mine seems to be fine. thanks for the reassurance.
Mark. Under acceleration the engine is not so quiet but it is a v6 against a v8-- and it's not loud enough to objectionable, more a different sound rather than too loud. Around town the overall noise level is I think a little lower due to the use of the electric motor rather than petrol engine. Road noise is not really an issue though I assume it may change depending on the tyres fitted, currently on Michelins. As it has wider and lower tyres than the 430 I think getting the tyre choice right will be important, better not going for a chunky tread rather a ribbed one. As far as I an concerned the quality is still right up at the top and I certainly have not rattles or squeaks, other members have complained about dashboard rattles but mine doesn't, fingers crossed that it stays as it is.
I think you need to drive one as it is different to the 430, and it all boils down to opinion and taste.
Graham. Yes it's still a Lexus just a different variation. I think it is different enough to be judged for what it is rather than to compare with the LS. I have nothing but praise for the cars I have had and like you will certainly not knock them. I did consider joining you with a 600 but due to having to buy 2 much lesser cars for work (Hyundai I20s) I could not really afford one at present and I had decided I wanted to try a hybrid so the GS really picked itself. Who knows perhaps I will back in a 600LS in a couple of years too.
Pete