I have been a TR user for a couple of years now and so far have had great success with any format plans I have used (HV/MV). My problem is I noticed my endurance fades quickly after 1h (on group rides) when I am only training with the MV plan. I feel like I have developed some type of mental block with anything longer and the only way I am able to break it is to jump back into HV plans with their long intervals and long workouts. I just finished the first week of HV (with same FTP I would use for MV plan) and was able to go through with no issues.
The TSS on HV is fine but the frequency is an issue for me. The MV has way too little of the long stuff and the only way around would be for me to build a custom plan. I am looking for shortcuts (Maybe HV minus 1 ride, or MV with all workouts substituted with their +2 or +3 versions for longer workouts?) I love what the HV plans have to offer, I just don’t want the crazy time commitment (I have a 3h commute and 3 kids…)