Hi!
For what I've read the past two weeks on different forums and review sites I can tell you that the Panasonic MX500 is an excellent camera.
-Good image quality when used with much light (sun/outdoors)
-True 16:9 format (does NOT stretch image)
-Optical Image stabilisation
-3 CCD
-Descent price
As for almost every cam out here there is one big "but". In this case for the MX500 it's the performance when used indoors. Image quality is dark and grainy unless you use a 200 watt light or more.
Why is it so bad?
-First the lens. An F1.2 lens passes through more light than a F1.8 Lens. The lower the F-value the more light the lens passes through and the better the low-light performance is. The MX500 has an ordinary F1.6 lens.
-Second: The size of the CCD. The BIGGER the CCD the LESS light is necesairy: The MX500 has small 1/6 inch CCD's
-Third: The MORE pixels on each CCD (higher density) the MORE light is needed (not 100% sure about his).... the MX500 has high density CCD's
Al together a great and a not to expensive cam for what you get, but NOT good for indoor shooting without extra light.
The VX2000, the XM1 and the XL1(s) do not suffer from low light. The VX2000 can even be considered the king of low light performance! (big CCD's and low density per CCD --> about 450 k pixels) However these cams are way more expensive!
The TRV950 floats between those expensive (3000+) cams and the lower priced cams (2000-) However this cam still costs about 2500 and makes it not a cheap deal or good value for money... It's a good cam indeed, but for me not worth the extra money.
So what's left? I already told you about F-value, CCD-size and Density. Now, the JVC GR-DV3000 has a F1.2 lens (good) and a CCD size of 1/3.6 inch (good too!) The CCD-Density is 1.33 mpix, but since this single CCD captures all of the light instead instead of splitting it on three chips the 1.33 mpix does NOT make this cam perform bad in low light for as far as I know.
Reviews state this cam is indeed a good low-light performer and if we take in consideration the difference between 1 CCD and 3 CCD is hard to see and the MX500 3 CCD cam is very bad in low light, the DV3000 would be my choice.
To bad there is a big "but" for this cam too: For some reasons the engineers at JVC decided NOT to include an external MIC minijack. No external mic for DV3000 users except the zoom-mic from JVC which can be put on the info-shoe. Too bad this mic is rated very bad (even worse than the build in mic). Sound is often underestimated and I would never buy any cam that has no external MIC input.
Luckily the DV3000 is about to be replaced by the DV4000 which will be available late April. This cam is similar to the DV3000 but HAS an external MIC input. The price will be about the same. The only "but" with this cam is the slightly smaller CCD size (1/4 inch). However this cam has a lower LUX-rating and should thus be a little bit better than its brother (perhaps JVC got it's hands on some higher quality CCD's that are smaller but perform better?)
Time will tell. When reviews about this cam appear i will read them. Then we will see if the DV4000 is a worthy succesor (or at least not worse than the DV300) If it's just as good or hopefully even better this will be my cam of choice
p.s See my other post in the Panasonic MX500 for pictures taken in low-light situations