 Metallica's James Hetfield is probably the most renowned user of the MX series, which he has been using since the late 1980s.He further popularized the series with his legendary "EET FUK" MX 220.and his custom ESP JH-2, a black MX 250 with diamond plating.Hetfield's equipment includes many custom made guitars that closely resemble the original EXP guitars in looks as well as specifications.