As a result of Jack Wu's kindness, I have had the Woo GES prototype in my house since CanJam ended. I have not spent as much time as I might have hoped with the GES, but it is a big improvement over the Stax 007t and made me actually think the Omega II was enjoyable (right before I sold them!). Although the prototype is an old model (obviously) and is not supposed to be up to the current production model's standard, it is a very good match with all of the Stax cans I have thrown at it. That would include the O2, 4070s, Lambda Pro, Lambda Signature, and Stax SR-5NB Gold, and each of them improved with the GES over the 007t. That is also saying something special because the 007t was being fed a balanced signal from the EMM Labs rig, while the GES got merely single-ended signal from lesser cables. Anyway, I cannot do a full review of this wonderful amp for lack of time spent and time to commit to it, but I can definitely say that its greater power and increased finesse both add greatly to the listening experience.
When I upgrade or add to my electrostatic setup, the Woo GES will be at the top of the list. Even upgraded in a few ways that Jack recommends and with top-notch tubes, it is still a much more affordable option than other available high-end amps. Also, it is a one-box and compact unit in the stock configuration, which is another plus in my book and given my overcrowded racks!
Congratulations to Woo Audio for another fine amp in their line-up. In fact, there is a rumor circulating (and I have not spoken to Jack about it yet) that there will be another Woo electrostatic amp in the near future. It is a higher-end model and I know basically nothing about it other than it is supposed to be on the way. I will be watching for sure!
Here are a couple pics of the Woo and Stax 4070s. I didn't have room on the rack for a solo spot so the GES is sitting on top of the VPI SDS speed controller. Enjoy (I know I do!):