This gateway is an active project of mine, I frequently add features and fix bugs.
For this gateway v1.3.0 is very stable. many fixes internally to make the socket connection stable even in very high traffic.
if you go to product's description you can see what features I added and fix bugs that buyers report.
Reliability in term of developer, I would rate 10/10
As for reliability for the software, I would rate it 10/10.
the software has zero downtime in the stable version.
you can try the beta version on my demo site wabot.arrocy.ml this is where I usually integrate new features, so expect some downtime.
If you want to test, user admin pass admin
go to settings -> add sender phone number, then scan with your whatsapp app from your mobile phone