Wondering why you wouldn't recommend it. I see many more positive reviews than negatives on it and some are from people making knives. Apparently some do have minor issues, but there are several simple how to's out there on how to tweak them and once tweaked right, everyone says they are well worth it and no belt slippage etc. Some other reviews say the dust collector isn't great, but again, there is about a 5 minute modification that fixes that as well. Nice thing is, if you get a dud, just take it back and exchange it. Again, I've done a significant amount of reading on this belt sander. Just wondering what your issue is with yours, probably a simple fix.
Use a 20% off coupon and this comes out to about $50.
http://www.harborfreight.com/4-inch-x-36-inch-belt-6-inch-disc-sander-97181.html
https://www.youtube.com/results?search_query=harbor+freight+4+in.+x+36+in.+belt/6in.+disc+sander+