I couldn't find anyone talking about this Transcend card: http://www.amazon.com/gp/product/B00AFTV3FC/
It's half the price of of the Sandisk, and reviews are saying it's writing around 40-45MB/s, that should be good enough for the most intensive patches.
I'm not an expert on this topic, but I quickly checked the german Sandisk-page and it says the same: writing speed up to 45MB/s (http://www.sandisk.de/products/memory-cards/sd/extreme-uhs-1-45mbs/)
I use this very model and it works flawlessly with Moon T5, it only won't span as far as I know (haven't actually checked myself). Hope this information helps.
UHS write speeds are not relevant since the GH2 only supports HS mode. There's no reason to use this Transcend card, since even the less expensive SanDisk Extreme cards support the highest bit rate hack settings on the GH2. Spanning is another question, with only the 64 GB SanDisk Extreme Pro card supporting spanning in some modes at the highest bit rates.
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