I’ve owned two of these mics for a while now, and I absolutely love using them as drum overheads or in a Blumlein setup. They sound fantastic and can easily compete with top-tier microphones.
However, I’m not a fan of their mounting brackets—they really need a shock mount. Fortunately, I found a Swedish store that sells shock mounts specifically for Golden Age Project mics. After swapping the original brackets for these shock mounts, the setup feels much better.
One thing to note is that these mics are quite gain-hungry and sensitive to phantom power. To prevent accidentally sending +48V to the sensitive ribbon and to get the extra gain needed, I purchased Cloudlifters. They protect the mics from phantom power and provide that extra boost.
All in all, after investing about two-thirds of the mic's price into upgrades, I feel like I have a very solid ribbon mic.