I've been using this caching solution since mid-2018 when we were looking into different alternatives as our previous one was not performing well enough (around 100 requests per second). It's fast! A lot faster than other solutions that are available out there -- at least 10x speed up compared against rediss or memcached enabled plugins like WP Super Cache but also MemcacheDB which doesn't seem very popular anymore these days so maybe it wasn’t even useful back then? The documentation could be better though some of them can only find by trial & error because they're either too vague/ambiguous etc., however if you have questions around setting things right try contacting support first before doing any changes yourself - just saying :) We weren't able solve all issues related specifically about PHP7 compatibility yet; still hoping someone will do something more elaborate regarding those limitations later down time line once its released.