Hello everyone,
I got a review copy from Festinger. And here's my review

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First impressions. Personally I liked user interface and design of Festinger's vault than native (default) Wordpress addons "store". I tried to think of words to explain here why, but don't now how to write that feeling

. So for me for better user expierience Festinger's Vault wins against Wordpress default.
Each addon has it's own page where you can rate, comment it or make a request for it if it is not yet available in Vault. I liked this feature, because you can read opinions from the same Vault's community. I know that Wordpress has it, and it's nothing very special, but it gives you additional scope to explore and evaluate addons. So you basically get not only simple access to storage to download plugins from, but also you get new ecosystem.
I found there what I needed, especially some Oxygen builder related stuff, which I really wanted and needed. I searched for Oxygen stuff, and there's was one specific thing that I wanted and I didn't even expect that it would be here, I was looking for some other Oxy related stuff and was very surprised when I saw it there.
Search option. Festinger's vault search does filtering as you type. When you finished typing addons name, you don't have to press enter or "Go" , your results will be already filtered. I saw comment in this thread, that someone didn't like that. I'm okay with it, you type what you are looking for and it's already searching and giving you results "on the go"

. For Vault there's no need to send request to a server, do filtering on backend and then give you response (filtered results). One thing that could be improved, when you type, it immediately starts filtering and icon "Filtering" appears (it's like loading icon), so when you see that, you naturally stop typing, because it's loading, and it does that after each letter. But I tried to type while it was showing "Filtering" , and I was able to, so you can type as much as you want while it's filtering, but that loading type icon gives you impression that you can't and you stop typing for a second. It could still show ongoing action "Filtering" while you type, but in not that way that you would think that I need to stop writing and wait a second. Although I wrote a paragraph about it, it's not really big deal, not annoying at all, and I am nitpicking a little bit here

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Price. For what you pay and what you get, it's totally worth it. For the price of a few packs of cigarette's you get plugins for your Wordpress site and updates. It's hard to think of other services/things with such quality and products that you could get for this price.
TL;DR.
Did I liked it - Yes.
Easy to use? - Very easy. In Wordpress panel, instead of clicking on Add Plugin, you click on Festinger's Vault and you will get a list of plugins, just like in Wordpress.
What you get? - Wordpress plugins that you would spend hundreds/thousands a year, support and constant updates. Instead of clicking on Add Plugin and getting free version of plugin, you Click on Festinger's Vault and get premium version of plugin. Simple as that.
Price/Quality - 10/10. One of the rare cases where you get much more, than you pay for.
Do I recommend it? Yes. If you are using Wordpress and spending a lot for plugins, you will save a lot of money. And you won't feel any user experience difference using this, instead of Wordpress default plugins section.
What can be improved. Search filtering.
An option not to automatically activate plugin I just installed?
Best Regards !