@SecretSquirrel makes some very important points in their post. Worth reading twice. 
In case it helps someone decide between the trial and starting a subscription –
Differences between 30 day trial versus a subscription:
- 90 days is the limit for historical data import. Once you subscribe you can load as much data as you want. More than a year is not necessary but you may want to see how Xert interprets the old data. Data without power is of minimal value to load.
- The trial includes a subset of workouts from the library with a wide variety of focus, duration, and intensities. Recommended workouts will be drawn from that subset.
- You can test the Workout Designer to see how it works, but not create any custom/coach workouts.
As I have mentioned elsewhere if you set a TED (target event date) that puts you in pre-base or post-event phase there is no specific guidance used for the focus of your training and the advisor (XATA) simply offers a wider variety of workouts near your Athlete Type.
Reference: Compare Plans – Xert (baronbiosys.com)