My idea for the testing phase is that there could be a button in the Book of Lore that added the Eraglass to your temporary inventory (with a button to equip Base Epoch in the Book of Lore as well) so that a lot more people can test it and give feedback, as well as decide for themselves whether or not to buy the class instead of relying solely on the general consensus on the class ^^
Personally, I really like the idea behind the class, the only issue I have with it is that there are no real places for you to burn your momentum (aside from Gunburst), so once you get there, retaining that 3+ momentum isn't really a challenge. My idea is to either remove the momentum gain off of some skills (such as say, Combo 1 and 2) or make certain existing skills (like Fade) consume some additional momentum for the same effect (like ShadowWalker's Shield) so that it becomes more of a struggle to keep up the momentum, or your choice of skills becomes more of a gamble. Of course, the reward may have to be increased to compensate for this, such as increasing the base power of Death Note.
As for the Accessories, it would be really cool if the Eraglass Cape (currently unreleased) would fill up based on how much momentum you have and rotate every time you gain a double turn as the pop-up says. Most people would probably have it hidden in case of lag but it's just one of those small things that would feel really nice imo.
Ofc, anything I said is completely just my opinion, feel free to argue with me if you think I got something wrong or said something illogical ^^
On the topic of the release, I really enjoyed it. The Verlyrus Saga, although not the most serious, is a saga I love seeing new additions to for some reason I can't really explain.
Can't wait for when it all ties into Exalted Lore and suddenly Book 3 ends with the end of this quest chain.