Fritz,
I have had a little experience with the HK-91 and copies. I have fired the HK91 extensively, in the thousands of rounds. It is a fine weapon that has strengths and weaknesses. I like the looks and the ergonomics of the rifle. It is easy to shoot well. It is put together like a tank. One of the strongest battle rifles out there. On the other hand, the recoil is a little more, but not much, as compared to the FAL or AR10. A deap cleaning is more involved, due to the design, but it really doesn't need that extensive of a cleaning all the time.
I give you all this background to set the stage for the experience I have had witht the copies...
I own a Springfield SAR-8, the one made in greece. It is the closest clone to the real thing. Made on HK equipment by HK trained staff in Greece. I have found the only real noticable difference is in the quality of the finish, just a little less than the HK. Accuracy, reliablility, etc.. is on par with the HK. I highly recommend this gun. You can find these for around $1100-$1250.
I also own a kit gun built on an FMP receiver. It was finished by Jim @ Protech. The parts kit was in like new condition and the receiver was new. All HK or HK contract parts. Accuracy and reliability is on par with those listed above, due to the fine craftmanship of Protech. Finish is undistinguishable from the HK. I am into this gun for about $900. The disadvantage of this route is time. It's definately not instant gratification, but to me the wait was well worth it!
Now to the real question you posed-- The CETME is a fine rifle and has the appeal of being different from everyone elses. Let me say from the beginning, I have only handled a few. From my experience, the guns are somewhat rudamentry. The fit and finish is lacking. The cocking handle is difficult to use and the bolt carrier is very tight. I understand they will loosen up after time, but new the ones I handled are very tight. The finish isn't very uniform. Meaning some of the parts are finished in different shades of paint. The metal and wood don't match up very well.
Some problems have been reported from a couple of owners, but Century will make things right. Your just without the rifle for a period of time.
With all this said, I must admit that I will likely pick one up. They are very inexpensive and I wouldn't worry too much about beating it up. I must admit, I like the wood. It adds something to the rifle.
It seems like the CETME is a luck of the draw, as with all Century products. Some will report absolutely no problems at all and others just the opposite. I would suggest a thorough inspection upon recept of the rifle. If something isn't right, send it back. They will fix or replace.
This is probably more info than you wanted, but I enjoy this type of rifle too. Good luck on your decision.
fuatos