We got a chance to ride one of the new '08 Comp X's - two weekends ago I think. In '07 and previous years the Comp X's were straight laminated 2 pound EPS - no stringers. For the most part those are pretty solid, but on a deep water start or someone too big for the board it could and DID snap.
Also, land from this height and it could break. The board in that picture has a stringer and is glassed light - 4 oz bottom and 4/4 top. Typically Mike would use 6 oz for production boards and you can always ask for a heavier lamination schedule.
Mike has addressed that by inserting a stringer into the board. As such, they are similar in construction to one off boards. It also felt like the lamination schedule was heavier...but I am just guessing on that last part.
Inland's have a layer of wood on the deck and bottom. That makes them pretty much bullet-proof, with the drawback of weight. The comp X is probably 2 pounds less than the 4skim. However, I don't think I've ever heard of anyone snapping an IS while riding.
The high end boards are truly performance boards built for a specific person, YOU.
For the most part, stock boards like any of the IS's or the Comp X fit a pretty broad segment of folks, but for custom performance nothing beats having a board built for you.
The board in this picture is 3 years old, but it's got some dings and dents, as well as, severe footprints on the deck...and we treat it pretty well - my guess is that an IS treated like this wouldn't even have a scratch.
In short - the reputation of the Comp X was earned, but was probably overblown for most folks. However, Mike has made an effort to address it, because...they did break in certain circumstances.