The SD-9 is a fine little camera from several years back. Its claim to fame was its small size and early use of SD cards. I think its highest bit rate was only about 15Mbps however. The G10 uses a bigger sensor, much more advanced compression processing. Honestly, when I have clips from my pro Sony HVR-Z5U HD camcorders on the timeline next to clips from the G10, it is very hard to tell the difference. The G10 is actually much more color accurate than the pro Sonys.
Furthermore, the G10 is a breeze to connect to the computer and use the Import from Camera in FCP X. The G10 comes with 32GB built in with two SD slots to go beyond that. I also have the HF M41 that uses the same sensor and has 2 SD card slots, but I never even have to use SD cards on the G10 unless I want to add them. It has a automatic relay mode that goes to the next storage SD slot when it has filled up the previous one. Thus you can use the internal 32 GB with a couple of other 32GB SD cards to get over 12 hours of the highest quality (24Mbps) video recorded. You can even specify to record to both SD cards at the same time so you have an automatic backup of your work.
Check out the detail on that review site I gave you. It's the best ... I'm not a cheerleader for it ... just stating the facts. I am very, very impressed. One of the best buys I have ever made in video work. Best wishes.
stephen