Well, the thing is that you should only buy IXO planes that you are sure that no other companies will make... cause they arn't that detailed. der!
Pay around $20 for their unique japanese and russian planes is worth it for me. I got the Ki-84 and N1J, they are good for IXO quality, but just can't compare with Corgi, Dragon and HM, and i had to mod them to make them look better. 
He-219 is pretty ordinary as well... -_- |
The detail point is on a case by case basis. In some areas they have more detail. Take the model "Big Beautiful Doll" P-51D for example. IXO includes a great looking pilot's harness (seatbelts?) in the cockpit while Dragon does not. (My Dragon BBD now has the pilot's harness after I installed Eduard's photo-etched set).
But generally I agree with you. I think in a lot of cases it's not so much that IXO lacks detail as much as they make it the wrong shape, as on all of their in-line engine US models that I've seen.