The BMW Z4 was not exactly a runaway success. Indeed, it was easily outsold by the Mercedes SLK throughout its lifetime.
The Z4's looks were also said to have put off a great proportion of the female buyers who helped make the Z3 a success.
The Z4 was also noticeably more expensive than a Z3 and was never sold in a more affordable four-cylinder version.
So while the Z4 was clearly a far superior car to the Z3, and a better driver's car than the SLK, it seemed to fall between two stools.
It lacked the handiness, hard-top security and chic looks of the SLK, but it also never gained a reputation as a serious driver's roadster in the manner of the Porsche Boxster.