I use trainerize with my in person clients as well, and the downside seems to be that when I open the workout of the day I have planned for them, and I press on box squats for example, there is the ability to fill in the reps and weight but I can't see what we did last week for example.
(so I can progress). Would be great if you guys could consider adding an exercise history (inside the workout of the day) hope you know what I mean.