I guess that is what inspiring Apple consumers helping other inspiring Apple consumer, that is what is Apple Community Discussion all about.
You might want to talk to somebody at Apple store, in person, at Geinus Bar to double check. They might, as well, know the workaround potential solution to a couple of Canon digital SLR cameras.
As for Final Cut Pro X, as far as it is, like & as you are, I am new to Final Cut Pro X. I purchased it through Apple App online. I definitely upgrade to Apple Mac OS X Loin as soon as Apple officially releases to general pubic.
As for me using Final Pro X, as it is slightly off-topic, but could be related to your situation whether the I/O connection works, and what's not, so on. Well, my spouse and I went to Europe recently for two weeks vacation to Spain and Italy. I got new Canon VIVXA HF S21 HD camcorder for my birthday. My camcorder is capable of recording a various formats such as AVCHD, and few others... While I was in middle of my decision, at the time few days ago, that Apple claims that it supports ALL AVCHD format from any kind of latest camcorders that records and encode AVCHD. At the time, I was not able to dig specific info on this until after I run into little hiccup small technical problem with Final Cut Pro X not able to read or understand AVCHD native files from my camcorder... So I look up under Help menu inside Final Cut Pro X regarding supported cameras. That was where I discover specific info I was looking for.
So, I am thinking about "upgrading" my current camcorder to Canon VIVXA HF G10...
Also, I own Adobe Creative Suite CS5.5 Master Collection... Recently upgraded to Master Collection from Adobe CS5 Design Premium... I had discovered that I can open and edit and connect to my camcorder in Premiere CS5.5 seamlessly. To find a workaround solution for my situation, I am able to convert AVCHD files from Premiere CS5.5 along with Adobe Media encoder app... I recognize that not everyone have the luxury to run or own Master Collection suite... Since I own a HD camcorder now, I see the justification in doing so to upgrade. Not only that reason, I have a couple of projects that I will be doing with for cross media publishing for iPad, iPhone and desktop or laptop computers.... Plus print media such as photography books so forth...
Additionally, I love to do lot of experiments with all pretty cool technology stuff...
I own a couple of Nikon dSLR cameras and a variety of lens...
Anyway, welcome to Apple Community once again. As for prompt response on the forum, it could be fast response. Or within few hours. Or a day or so. Or some cases, none at all. It just depends on HOW individual ask specific question to seek for specific answer or solution... I am sure you know what I mean.
If you go to Apple store in person, could you let us know, so other individual similar to your situation will know. Up to you!