I completed the TRTO with Astraeus in Jan and then did the NG differences before going to Excel.
The Cost from Astraeus was £1500 as a bolt on, and we were given one bit of photocopied paper and a fixed base, followed by a full flight session. I guess this is a minimum requirement, but I did'nt feel it was enough, other than as a paperwork exercise.
At Excel, we then had two more fixed base and five full flight and five days ground school to do the job properly.
I gather Easy is about the same.
Question is: do you just want it on the licence or do you really want to be able to operate the airplane?
Draw your own conclusions.