My company has a good impression of IBM DataPower Gateway. What I like about it is that because it's an appliance, it's a turnkey solution that's very fast and out of the box.
Compared to other gateways, I also like that IBM DataPower Gateway is function-rich. For example, for one of the projects, there was a need for specific transformation and security features available in IBM DataPower Gateway out of the box, so my team just needed to configure the appliance. There was no need for separate development, and I found it quite neat.
Another valuable feature of IBM DataPower Gateway is that it's easy to integrate with other products.
