I don't really care about clones or design copying. I have a few clones. They are not even in the same category as the original knife. They generally cost less than half what the genuine article would set you back, which puts them in a different price bracket, IMO.
I have a few fakes. One of which is a clone of a Spyderco Military. When I bought the knife, I had never used, much less held a real Spyderco knife. After a few weeks of carrying my Spyderco clone, I was sold. I really liked the knife, despite the fact that it has a few flaws I knew I would not see in a genuine Spyderco. I now own several Spyderco knives.
Last year I bought one of those Kevin John Strider clones. Great knife. It doesn't even have any of the issues that most people talk about with genuine Strider knives. However, after using the knife, I still want to try the real deal. I just hesitate to drop over $400.00 on a knife that I may not like. Picking up a clone for $100.00 to try out works better for me. I did learn that I'd rather have the SMF since my SNG clone feels a bit small for me. I'm currently shopping around for a good deal on a genuine SMF.