I've got the same kit, courtesy of A4K, and I can safely say it's the best Spitfire kit available - until the recent arrival of the tamiya 1/32nd scale kit that is. The ICM kits are all the same, just different boxing and decals, and can be built as MkVII, VIII and IX, in the various options. The kits are accurate, extremely well detailed, and go together well. However, to the not-so-experienced modeller, the actual fit, and the prescence of some flash here and there, might seem a bit 'off'. But, with careful handling, there shouldn't be any fit problems.
As for the tails of inaccuracy, the only semi-questionable area I know of is the control column grip, which is more of a rounded-off square, rather than the familar circular grip. To be honest, this will hardly be noticed once installed in the narrow cockpit, and I have actually seen at least one grip, on a MkIX, which appeared closer to the kit shape than the 'normal' grip, and might be a production batch difference, to accomodate the later style cannon/guns firing biutton incorporated in a single housing. There has been some debate about the upper cowling shape, but both styles are included, and the only ever so slight possibility of error is the spinner. I can't comment fully on this until I've assembled the model, as the spinner alone, not on the airframe, can be deceiving. If it is slightly wrong, then it can't be by much, and again shouldn't be glaring. Bottom line again, the best Spit kits, certainly in these Mark numbers - and especially at the very reasonable price too!