What about the 'Hair Dryer' Nick ? A +6 wouldn't have been any more unorthodox than the +8 when it was introduced. Marketing aside, the +4 should naturally have evolved into a six cylinder car.
When I was weighing the 'Pros and Cons' of the 4/4 vs +4, I came to the conclusion that basically, I was expected to pay a big Premium for the cachet of having the 'Plus 4' name on the bonnet. A well sorted 4/4 as 'Arian' will be, once the engine warranty expires, will see off a 2 litre +4 and then some. The performance will also come at much lower cost to me.

Unfortunately, the 'Roadster' was not on my 'Shopping List' as my Madame vetoed the additional cost: the money can be used for something useful!