The Leatherman Wave is an excellent tool. A LM Wave is my multi-tool for wildland and SAR work, for the money you can't go wrong. I have found it to have the right combination of tools with a decent blade (not great, but better then many multi-tools).
There isn't many survival tasks I can think of that I couldn't do with a Wave. Some tasks are simply easier because of the other tools available on a good multi-tool. A good folding survival knife will make some tasks easier and safer, I still always back my Ritter RSK up with a Leatherman Wave or Charge TTi.
You never know what you may have to fix... even in the middle of no-where.
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"Trust in God --and press-check. You cannot ignore danger and call it faith." -Duke