The jury was always out on customer cars in Formula 1. A huge part of the category's formative years, in which private entrants frequently bought up machinery from the likes of Lotus and March, 21st-century variants were looked upon with greater disdain.
Some weren't particularly happy that the Super Aguri team could get away with buying up previous-spec Hondas, or that Toro Rosso could use the same car as sister squad Red Bull. The resulting opposition nipped a potential Prodrive entry in the bud, having agreed a deal with McLaren to buy its cars for 2008.
As it happened, any last vestiges of the customer car era were swept away at the end of 2009, closing up the loophole Toro Rosso used to get access to an Adrian Newey-designed chassis - meaning it would have to design its own for the first time since the Minardi days.