The customer support team was excellent! They helped us with any question we had regarding Trustzone's products or services without hesitation when there were time constraints involved (we needed them to respond within an hour).
I do not have anything negative about their product nor service at this point in my opinion because everything seems great from our side - but if you are searching for something specific that they don't offer it can be difficult finding what your looking for since other providers may already provide those features elsewhere than trust zone. We used Trusted Zone as part of one cloud solution where users could access corporate applications remotely via VPN connection over secure tunneling protocol like HTTPS etc.. This worked really well until recently due to new updates which made TLS 1.3 mandatory.