[ Have you had different experiences such as boat diving in large waves, shore diving from a rough shore, diving in currents, drift diving, diving around wrecks, tropical diving, mild deco diving, without a leader? [/QUOTE]
I totally echo this post. I went through AOW, other asst specialties, had 50 dives and almost enough specialties for Master Diver with SDI (which at that time was 8 specialties + Rescue), before I ever did my first salt water dive. Not by plan, but by geography. My first ocean dives were in Costa Rica, and even though the vis sucked I thought I'd died and gone to heaven. Even getting somewhere around a hundred dives a year in the first couple of years, it took me a good two years before I would have considered DM. (Which I have not done yet, mainly due to time considerations.) IMO a DM is responsible either legally or ethically for people's lives and he/she should have experience in all types of situations. Not just lakes. Not just FL coast dives. Not just Keys. Not just NC coast, which can get really rough. Lots of different scenarios. I think you'll know when you're ready for it.
It's kinda like a post I did on here a couple of years ago. I had been on a trip to Deerfield Beach and seen an instructor candidate knocking out his last required "dives" by hanging on the anchor line at 20', getting in 2 or 3 dives each time we were diving a wreck. The boat captain knew what he was doing, and congratulated him on his 100th (I think) dive. It was probably his dive op that was doing the "training"! Now that's scary. I certainly wouldn't want my life to depend on him.