I do not own a 3550z, but I do own a 2550z.
I have to say upfront that what you will likely find around here is most opinions on that guitar, and any Prestige, will depend upon the opinion of the Edge Zero. The Edge Zero is not very popular around here, with most preferring the original Edge or the Lo Pro Edge, and maybe a few preferring the Edge Pro. I'm going to leave it at that and not get into pros and cons. If you want to find out more, a search will provide many more pages of discussion about the EZ than I can summarize here.
: try one out before you buy if you can. If it seems ok to you, go for it. It's an entirely adequate and functional tremolo unit.
From strictly an ease of ownership perspective, the EZ is only slightly more complicated than any other tremolo unit. Remove the ZP bar and then it's basically no more complicated than an Edge or Floyd Rose.
I have multiple guitars with Locking trems. I don't set them up and I infrequently change strings. I get a professional set up with a trusted and knowledgeable tech using Elixir strings and then I basically can forget about them for several months. Maybe on an occasion I'll unlock the nut and make sure the guitar is truly 440mhz. Maybe. Big maybe. Usually I just fine tune the strings I bend the most and fine tune the thirds as is required from chord progression to chord progression. I'm lazy like that. It worked for Eddie Van Halen, and it works for me.
YMMV depending on tremolo use. I'm not a heavy user as some.
If you want an idea of how a typical double locking tremolo is to maintenance and setup yourself, you can find lots of tutorials and information on the internet. Keep in mind it will be slightly different for an Edge Zero in terms of set up, but the fundamentals will be the same. I believe there's a tutorial around here for the EZ or ZR (a bit different than the Edge Zero, but has the ZP bar system) that you might find helpful.
Otherwise, as Jeminizer said, this is a good starting place for all things related to Ibanez setup...
...and is widely considered the best "ending place" if you do want to buy an Ibanez.