The FTP builder works ok but I could also side with some who’ve mentioned that the beginning is a little easy.
Power reporting latency is too high, by the time the app tells you you’re putting too much power down you’ve already adjusted down and then when you adjust down more it tells you you’re not putting out enough. There’s too much lag in the recording / displaying of the power, you react before it ever tells you you’re too high…then it’s just a see saw back and forth too little, too much, too little etc. Something needs to be done,.
Warmups - your warmup starts at X watts but if you have a ramped warmup they increment the watts they want you to put down at some point…but A) they don’t tell you when that is, and B) they do nothing with the number on the screen to draw your attention to it, you just look up at some point and the number has changed.
transitions between low / high watt output is erratic and immediate. People can’t go from 155 watts to 300 in under a second but the app starts flashing red immediately. A brief transition should be implemented, otherwise you start the overshoot / undershoot problem with your watts, i.e. one second too much the next too little. Real people can’t go from one number to the next without adjusting and the application complains if you have to adjust.
Overall it’s ok, or seems to be ok at this point, I’m just in week 3 day 4 so I skipped the first two because they were unnecessary. I at first thought it was way too easy but now I’m seeing that there is some benefit to how it’s progressing. It will force you to ride at a cadence / power level that you won’t like or you’re not used to, which is the point. We shy away from power levels or cadences that are uncomfortable for us, but those are where the work needs to be done.
My ave watts are a lot lower than normal but I bet within a couple weeks it’ll be hard enough that I can appreciate the first two weeks.
As for your FTP Zwift will calculate your ftp based on how you ride in the application, so you should do a few rides before jumping into the FTP builder…in fact you should do several. Climbing is a good way of representing your power level too.
Use it as part of your training but not all of it. I have other rides and HIIT training I’m doing too.