There are different types of guided dives.
At one end of the spectrum are guided dives where divers get herded around in relatively benign conditions, sometimes with restrictive limits on time or depth for no good reason. This is the type of thing that gives "guided dives" a bad reputation. For some people it may still be the right thing. Others will find it unacceptable and experienced divers are going to try and avoid this. With a little experience diving in CA you probably don't need that sort of thing, though you might like someone to show you the local critters at least at first.
At the other end of the spectrum are guided dives in areas where the conditions are often fairly challenging in some way, usually because of strong and sometimes unpredictable currents. Many places in the Indo-Pacific fall into this category, and local knowledge can be really important to dive safely, never mind find the critters or a specific place you're trying to get to. Most probably you really do want a local guide in those places. At your level of experience you want a guide someplace like Komodo - assuming you are even ready to dive there. I haven't been there yet, and at nearly 1000 dives I sure as heck want a guide there. Most places like this you will usually find that you appreciate the guide most of the time. If there are simpler dives where a guide isn't needed to prevent things from turning into a total cluster, and they've seen that folks have a clue, doing your own thing if you really want may be an option. (There are places where guides are required because of some local law, sometimes for good reason and sometimes not, but thems the rules.)
Guides are also hopefully good at finding and showing you the local marine life. How much you need this is going to depend how much you have dove in an area. Usually I don't need anyone showing me stuff in most places in the Caribbean (though I'm certainly not going to object to having a seahorse or octopus pointed out!) Most things there I've seen plenty of times and it's more fun to find it myself. But for most dives in the Indo-Pacific, with it's greater biodiversity and where I don't get to dive as much, a good guide should be showing me a ton of stuff I would probably not see on my own.
I just realized another thread I replied to where there were concerns about how advanced Belize diving was, was yours as well. Let's just say worrying about Belize, and not worrying about Komodo, is WAY backwards.
