Good morning Walt,
Yeah, I've used flooring before and also heard of guys on Knifedogs here using it. The drawback is that it is not stabilized so it is absolutely more susceptible to moisture and such stuff if it will be in an environment that is wet or is involved with chemicals/oils or the like. Now, this is not usually an issue if your making a show piece that will sit on a shelf or a box that will for the most part be in stable conditions. You'll probably just need to find a finish to apply to the wood when you have the knife complete.
Problem #2 is that the the resin really do what they say, they stabilize the wood so when you drill, sand , shape, pin, or clamp your scale or handle that it doesn't split, crack, or chip. Plus, in my opinion the wood finishes nicer and has a tighter look because of the resins that fill every pore in the wood.
Problem #3 is, and most will agree, that the process of stabilization really enhances the grain of most wood, so the look comes out a bit more enhanced, sort of making it pop!
All that aside, I'd definitely take advantage of the source with the thought that I am getting a chance to work and learn new products and procedures and hone my skills. It will definitely be worth the effort, and like you have stated in the past, you need the use the materials that are available to you. I always try to keep moving forward, even if I'm stepping out of the box so to speak, I'd rather be working on something and make the mistake than be sitting around not trying something new. Tigerwood and Acacia both are great wood for handles, so go for it, just find a way to finish it at the end.
Lastly Walt, what in the world were ya doin up at 4:45am on Sunday morning???? LOL!
Hope this helps, go for it! Time to get ready for Church.
Wayne