It all depends on whether you can be flexible with your travel dates, and if you are able to travel outside of school holidays.
I have used my ST a fair bit in the last few years, virtually all long-haul, and all over the world. Managed to get quite a few flights in comfy seats and every trip I have arrived where I wanted to on the day I chose to travel - just make sure you have got plenty of backup tickets so you can vary your routings and fly with other carriers if necessary. Also, you need to be able to check the loads on your planned flights, so you can change your travel dates at short notice to aim for the emptier flights.
Enjoy it!