I would rate this solution a nine out of ten. 

My overall rating for TeamCity is a 6, but I acknowledge that this rating is based on my limited experience with the tool. I haven't delved deeply into its functionalities or compared it extensively with other automation tools, which is why I consider it an average rating for now. 

I'm a customer and end-user.

We're using the latest version of the solution.

It's a great solution. I only wish they spent more time working on the graphical part. It would be nicer and more focused if they did.

I'd rate it seven out of ten as it is easy to start with, and it's not complicated to deploy in your on-premises deployment. 

Wish the Tomcat server could magically convert to HTTPS (instead of the apparent default of HTTP).

There are published works on using TeamCity (separate works by authors Melymuka and Mahlingam, both on Packt Publishing), however both of these are out of date which makes the initial learning curve more challenging.  I invite these publishers to update their work; would gladly purchase updated revision.

We're just a customer. We're using the most up to date version of the solution currently.

TeamCity is our main continuous integration tool, however, it is deployments that we were looking into improving. With Harness I saw that the deployment process was very polished. And at this point I was wondering if there was any interactivity between the two solutions, or just what would be the benefits of just switching completely to Harness. We're currently researching that now.

I'd advise other organizations to do a lot of research before you begin creating anything.

The solution needs a lot of maintenance in the sense that you need to understand all the different pieces. You need to be able to look at the servers and the agents, and, if you're going to implement anything new, you'll need to understand it is going to take a while to get it right.

I'd rate the solution eight out of ten.

I rate TeamCity eight out of 10.

Start small. Start with just doing builds before executing tests.

Do it! Very easy to use and very stable. A must have tool for any teams using agile methodologies.

We have more than 50 users in our organization who are making use of the solution.

There is much online documentation for TeamCity, with certain learning materials such as videos. There are many free courses, as well.

Someone considering the implementation of TeamCity should first define all of his use cases. If the person wishes to integrate it with infrastructure, but is a junior engineer who lacks experience with DevOps tools, he would need to do some learning. This said, the solution is a great tool for CI/CD. 

The solution has all the features that I need, with a good user interface. I'm pretty satisfied.

I rate TeamCity as an eight out of ten. 

Make sure you define the standards and naming conventions prior to implementing TeamCity.

Get someone who knows it well to go through the basics, but there's also loads of help on Google.

It really is dependent on your product needs. Do market research and see the pros and cons versus open source or any other solutions out there.

It was simple and easy to use. Great features which are always customizable.

An FAQ section with all the most common issues/most asked technical questions would be more than welcome.

With low costs to adopt what are you waiting for?

If you need an enterprise build management tool, and your budget permits, it's absolutely worth looking at. Even for independent developers with a limited budget, JetBrains allows you to use the product for free up to a certain number of projects. I use it for a personal project at home, and love it.

Use Templates and meta-runners, they are very useful in scaling your product with new releases.

Try to think about pipeline before buying this product, you can set it up on one machine and try it out.

We use the on-premises deployment model.

I'd advise others that it's absolutely necessary to use an integration tool that can run integration tests. 

I'd rate the solution eight out of ten.