ZDP is great stuff for slicing and holding an edge. Conversely it is not as flexible as most other steels. Twisting while cutting may cause chipping. Prying is totally out of the picture. Some people have rusting problems but that has never occurred with me. It holds a great edge for a long time. I have 2 ZDP Endura 4's, PE and SE, and love them both. Took the PE down to around 20-22 degrees inclusive and it cuts great. I left the SE as is and it will cut through just about anything. I have found that ZDP is a great cutter and the more controlled your cuts are the better it performs and the longer it holds a good edge. I have snapped a Blur ZDP composite blade with very slight prying, a stupid move on my part, but that's the way ZDP is. I don't know if the ZDP Delica is a limited run.