Steve,
There is no problem with handling, just the fact that they are a fwd turbo car that are being being driven by people with no concept of how to drive one.
We replaced the missus's ST200 with one about two months ago and I love driving it as much as she does. COmpared with the 535D I drive daily it is a little go cart.
We are getting her's Mountuned shortly as it will not affect the warranty and is recognised by the insurance as an ST260 then.