Wrike has helped us increase productivity exponentially

Wrike is better suited for project management, reporting, task management and allocation than it is suited for event management (where something like Cvent would be more appropriate). Time tracking, billable/no-billable hours and hours allocation (for example if you intend for client billing) is functional but still a lot of room for development.

Wrike has been fully integrated into the way we work. I can honestly say it has helped our organisation grow and has grown with us. We used to be a team of only 2 Project Managers. In less than two years we now have 3 Pods comprised of 3 Engagement Managers, 8 Project Managers and 6 Project Coordinators. Our leader is really grateful at this point that we were able to set up Wrike from the beginning. Onboarding is so much simple when you have project templates, allocating projects is also easier when you have one place managing and giving visibility on individual and pod capacity. I cannot see where we will stop using wrike anytime soon.

The implementation could have gone better if we did our homework first. Wrike has so much capability and features. I felt that if we had a better idea on what we needed and what we wanted to do, we would have gotten more out of the implementation / consultant meetings in the beginning. As it was it ended up that a lot of it we had to learn along the way as we grew as a company. Best advice I can give is organise your PMO / internal processes fist, then go into Wrike. Wrike will not fix your processes for you.

They helped us a lot in the beginning in setting up, but it would have been better if it was a more involved process--more guidance on the optimal way of using rather than teaching us the technical side. That aside, it was certainly better than what the other services offered. In fact, this is what tipped our decision to use Wrike. They offered good support from the beginning, and still do until now.

Usability off the bat is fairly simple and straightforward, IF you know what you want and are a fairly experienced Project Manager.
If you were totally clueless like we were you will definitely need some guidance from Wrike or hire a PMO expert / lead to guide you through the best use and set up of wrike. Without this guidance and setting parameters and rules in the beginning, it will get messy very quickly. After that it is easy to learn, use and onboard newbies.