-- Last Updated: Mar-31-13 3:29 PM EST --
I have a Q400S (only 1 hatch) in carbon/kevlar. The weight reduction was worth the cost, in my opinion, and feels significant. The boat is a pleasure to paddle, glides well, behaves predictably in confused water, is beautifully constructed, etc. It is a roomy boat - I am 5'9" and big, and there is plenty of room.
If you're shorter than 5'8" or so, I would guess the Q10X would fit you better. The only issue is the width - the Q10X is a scaled-down version of the Q600X, which is a performance model, whereas the Q400X is a general touring kayak. If you test it and are comfortable with the initial stability, it should be a great boat.
There used to be a Q300 model, which was a scaled-down Q400, but it's been discontinued. It was 13'6" by 24.5" wide. I recommend reading the model descriptions at Water Walker, as they contain the designer's statements about the various QCC boats.
PS Here's the Q300 page at QCC (even though discontinued):
Sport Cases (Electronics)
Cartop Kayak Carriers
Reflective Hull Decals
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