The MOD knife is a pretty good piece of kit. Very simple but strong. Nothing to break off.
Yeah the sheaf isn't the best but some expensive brands of knives have pretty shabby sheafs themselves.
I highly recomend the Mod knife as a survival tool. It has enough weight in the blade to assist in chopping as well as digging for bush tucker. Doing a bit of work to the lower end of the blade will give you a highly sharp cutting edge useful for pairing and some fine cutting. Most people will carry a pocket knife or leatherman style knife as a second blade anyway.
I use a Mod knife, and have also used a cut down machette as well.Prefer the Mod knife.
Cheers.