StackState

StackState is suitable for 1000+ hosts. Sometimes specific applications can take higher development time.

Well suited for hybrid platforms to build end to end service alarms and service views. Advanced UI navigation might require some training.

It is not a simple download and deploy software. It will require development in an agile model. Where newer versions are deployed to suit exact client requirements. Support contract with the StackState Engineer for development of use-cases is required and very useful.

Transparent communication and a lot of effort put in by StackState engineers till all the requirements are fulfilled.

Usability depends a lot on adaption of the tool inside the company. Overall StackState UI is quite [and] easy to understand. However, some parts require training which is also available. Easy to integrate with different tools is good. However, since we already had a set of monitoring tools, the PoC was mostly aimed to see what additional features or visibility StackState brings.

Aggregating (not only monitoring) info provides great insight in our environment.
We (currently) use it less for "process tracing."

It's swift, they're thinking along with us. It's a "collaboration approach" rather than a (traditional) customer-supplier relation.
Out new ideas are taken in concern and often ends up in enhancements of StackState

The usability is good, the tool is improved every quarter.

If you have a very specific thing you want to monitor in your IT stack I wouldn't recommend StackState. That is as overkill as trying to catch a single fish with a commercial fishing rig. There are much lighter better suited tools for such tasks. However if you desire a complete overview of your stack, fully customizable with advanced relational properties and monitoring capabilities, StackState is the perfect tool for that.
In short, it is for big fish, not small fish.

Great personal contact and friendly support. They are always available very quickly and know their stuff.
Some of them feel more like internal colleagues than external support.

Great features and functionalities, however as stated before documentation is lacking, which decreases all round usability.
So support is necessary to fill in the gaps. Luckily the support is amazing.

On complex landscapes which consist of different platforms and teams, it will excel in bringing the teams together to understand each other better. In small environments within a single platform, it will probably be less appropriate if there is a good solution in the platform already. But dependant on the use case, there can be value in that as well.

They are friendly and supportive and will adjust to your knowledge level. So no annoyance where you first have to go through a first line script to get to an advanced question answered. Response times are good, and they will onboard the proper expertise to solve your issue fast. They will always ask if the ticket can be closed and if you need any other assistance instead of auto closing without communication.

Some elements of the product haven't had the usability upgrade yet and can be a bit technical. This is to be expected as they are trying to solve complex problems. I am sure that in the future, steps will be made to simplify this as well for the users / administrators / developers of the platform.

StackState is very helpful in implementing, great support, if they don't have an answer, they will find a working one. It is more a partnership, then a business that tries to sell their product. It feels like you have extra colleagues in your company.