I prepared pretty well for this exam so I didn't find it too difficult. I used Pluralsight series for this exam, Sybex's Microsoft Azure Architect Technologies and Design (Study Guide), plus a few other materials including quite a lot MS documentation (read well Overview or FAQ pages), but I found interesting Mark Grimes' YouTube videos (1, 2, ...).
Next obvious step is AZ-303 scheduled in a few days. Sure is easier to prepare for both at the same time.
The only negative was waiting an hour on VUE online app to be verified before starting the exam. They talk about 15 minutes but in my case was a full hour.
