The customer support team at adrenalead are very helpful, they have helped me fix issues I had when my site was not sending push notifications correctly (I think it might be due something wrong within our servers).
Their products do work well for us but we still need some more time before everything works as planned so that's why there could always room for improvements! We use Pusher integration which helps manage all web pushes from one place - no messing around or wasting resources anymore :) Our customers get notified about promotions straight away via browser notification popups without having any other apps installed like Whatsapp etc., this has increased user engagement significantly compared to just relying solely upon social media posts alone through Facebook ads / Twitter Ads campaigns only!! Also saves bandwidth too since users don't require downloading additional app installs unlike whatsApp where you would normally end up installing WhatsApp Messenger App if your target audience uses mobile data plan often enough ;) It.