The original setup was probably done in-house, but I'm not sure because I wasn't at the company at that time. We have two environments, the data center and production. The production environment took about 16 hours to deploy. 

I deployed this solution, myself, and no additional staff is required for maintenance.

We did it in-house.

I'm the administrator for our ER/Studio setup for our IT department, we have 5 or so actual users of the tool.

We did it in-house.

It was done in-house.

I implemented just my own copy I didn't do it large-scale implementation. Other people within the company use it but it's independent for each user to set their own environment up I didn't have any problems or don't have a particular recommendations for other companies it's pretty straightforward.

We did the implementation ourselves.

Our implementation strategy was to generate SQL out of the tools, so I could have scripts, which we could then deploy to other environments.

We take care off all maintenance/upgrades of the toolset in-house.

It was done in-house.

I did everything, from the installation to using it.

We used a vendor team who were good.