I bet Brorsoft AVCHD to iMovie Converter will be your best choice. It not only help you convert AVCHD to iMovie, but also let you experience the fast conversion process. Besides, the powerful program allows you freely select or edit the video and audio settings for choosing the quality as you like. Plus, I have been using it for a long time and I've never a error with it. It works fine, it help me a lot, I like it very much. Why not trust it?
Step 1. Add files to the converter.
After opening the program, please click "file" to load FS700 or FS100 AVCHD files to it, you also can drag and drop several files to the software.
Step 2. Choose output format.
Please select the best format from "Format > iMovie" for converting to. iMovie's native foramt is "Apple Intermediate Codec(AIC) .mov".
Tip: If you wanna edit the video/audio parameters, you need to go to "settings".

Step 3. Convert AVCHD.
As soon as the above things are ready, you can hit the "convert" to transcode Sony FS700/FS100 AVCHD to iMovie effortless.
Step 4. Get the converted clips.
After converting AVCHD to AIC, pls click "open" to find the converted file. Now you can smoothly import the video to iMovie 8/9/11 for further editing on Mac OS X.
PS:
1. In fact, the convert tool offers a good deal more functionality than this article could touch—for example, trimming video, merging files, deinterlacing 1080i footage. I believe you will get a big help.
2. Best video/audio settings:

Related Guides:
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Make 1080 50p/60p MTS editable for iMovie
Convert Sony RX100 Full HD MTS to AIC for iMovie 11
Import Panasonic HC-X900(M) recordings to iMovie for editing

