Hi delaluz - I have both the TM900 and the FZ150, and the TM900 produces higher quality video images, but not by much, in my view. That said, when I have a choice between the two cameras, I carry the FZ150, because it is easier to use (more manual controls). I will try to answer your questions one-by-one below:
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Originally Posted by
delaluz 
I am looking for a camcorder to video my grandkids lacrosse, baseball, flag football, etc. I was considering a Panasonic TM900 which costs about $800. From the looks of your videos the FZ150 could be a better choice. Could you compare your TM700 to the FZ150 ... specifically:
1. is there a recording size limit on the fz150?
No limit in the US
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2. Is the FZ150 as good or better than the tm700 in low light?
I would say that it is just as sensitive as my TM900 in low light, but the TM900's picture quality is better, as noted above.
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3. does the fz150 focus as good or better than the tm700 for sports like lacrosse, flag football, etc.?
Yes
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4. is it just as "easy" to video with the fz150 as the TM700?
Easier, in my view. The rotary dial on top of the camera is great for mode selection, as is the one touch video button noted by techspark above. With the TM900, if I'm shooting stills and want to shoot video, I have to move a small slider on the top right side of the camera. Not as easy.
I also like the FZ150's flip out GH2-style LCD, which can be used without having it stick out of the left side of the camera. I prefer this to unsupported camcorder LCDs - I also like the FZ150's EVF better than the TM900's.
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Any other general comparison comments?
Please see my FZ150/TM900 comparison blog post here:
http://hybridcamerarevolution.blogsp...and-fz150.html
If you need near-ultimate small sensor video image quality, a touch screen, a headphone jack, or built-in internal memory, get the TM700/900 (or one of the 2012 models like the
XC-V700MK)
If you want something a little smaller, with more manual controls when you want them (instead of menus), RAW still photography and a pop-up flash (instead of the TM900's flash, which is buried inside the lens ring & is unusable with a filter on the lens), get the
FZ150 and save some money.
Hope this is helpful!
Bill