Carbon I14 was pretty tricky.
Narrow hull and used to get over powered really easily on the jib, dig a wing in, stall on the wing and capsize.
The low riding moths look like a bit of a nightmare though!!!
Tried a low riding moth, at 330mm hull width with an aluminium mast, in under 6 knots of wind. Not impossible but had to really take notice of what was going on and couldn't expect it to just happen on demand.
No nightmare, just a great challenge!