Thanks to @Vitaliy_Kiselev, I just got this cage for my GH2. Let me preface this by saying that I made this purchase with full knowledge of the compatibility issues with the GH2. Some thoughts:
The design and build are of tremendous quality -- very robust and well-machined. It was heavier than I anticipated, but makes my Sachtler Cine DSLR system much easier to counterbalance.
The height issue doesn't really bother me, and should be correctable with the addition of a Lanparte or other height-adjustable base plate, as mentioned above. (If anyone has already gone this route, I'd be interested in hearing your thoughts.)
The obstructed battery compartment is the biggest problem, but I don't think this flaw is attributable to the 5D-centric form factor, but rather, to the included camera mount plate. I decided to pull the trigger on the cage after viewing this video review, which highlights the camera mount plates lateral adjustment capability:
Judging by the video, I assumed that mounting the GH2 on the left axis of the plate would align the battery compartment with the battery port on the bottom of the cage. Unlike the mount plate in the video, however, the plate I received lacks such lateral adjustment capability. I sent an email to Trusmt comparing my mount plate with the one highlighted in the video, and they replied with an acknowledgement of the problem and an offer for a $35 refund (I think -- the language barrier is significant). A nice gesture, but one wonders why they continue to falsely advertise this cage as having been ported to accommodate the GH2s battery compartment.
Now the question is: where I can I find a compatible camera mount plate with lateral adjustment capability? I'll likely invest in a coupler/Tekkeon battery set-up, but still hope to find a more elegant solution than unscrewing my GH2s battery compartment door. Any ideas?
Even with the above trade-offs granted, I'm still very pleased with the purchase and wouldn't trade it for a ReWo cage.
UPDATE:
After a lengthy email exchange with Trusmt, they finally understood the problem and shipped me a replacement mount plate with a laterally adjustable camera screw, free-of-charge.
As I suspected, this new plate resolves the issue with the blocked battery bay. Although it's still necessary to remove the GH2 from the cage in order to change the batter (though I'm still hoping to resolve this with a good height adjustable mount), I'm now more comfortable recommending it for use with the GH2. No more removing the battery plate with a screwdriver!
The new mount plate also better centers the GH2 inside the cage, though it's still too short to reach the hot shoe mount. I don't mind the height issue, as the gap between the camera and cage top provides a nice grip for carrying the rig. There's really no need for the $50 top handle when using the GH2.
I also really have to commend Trusmt's exceptional customer service. My replacement plate was delivered in three days time, at no charge. They really went above-and-beyond to ensure my satisfaction. I hope they offer the laterally adjustable mount plate as a standard option with the Ultimate Cage moving forward.
@apriori it would be interesting to see if you could try it with the ownuser batterygrip to raise the camera.
@DirkVoorhoeve Someone has accomplished this with Sugru putty: http://www.personal-view.com/talks/discussion/2256
Interesting, but a bit messy for my taste. I'm still looking for a more elegant solution, but will let you know when I find it.
Yes, their customer service is exceptional, they sent me the fixed arm for my FF right away.
I'd recommend TrusMT any time. Beware of the Chinese, folks, they are learning quickly how to improve their products and how to sell them properly ;-)
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