Although the band have never enjoyed major commercial success and had several lineup changes, IQ have built up a loyal following over the years and are still active as of 2024, currently with the original recording line-up (with the exception of Orford).

This accusation has been strenuously denied by Martin Orford, who is against the use of the term "neo progressive"[3] and claims the band have wide-ranging and eclectic selection of musical influences.

[emphasis in original][5] From 1982, the line-up consisted of Peter Nicholls (vocals), Mike Holmes (guitar), Martin Orford (keyboards), Paul Cook (not to be confused with the Sex Pistols' drummer of the same name) (drums), and Tim Esau (bass).

In early 2005, member Paul Cook left the band and was replaced on drums by Andy Edwards (ex Robert Plant drummer).

On 20 July 2007, Martin Orford announced that he was leaving IQ and he was replaced by Mark Westworth from prog-rock band Darwin's Radio.