Monthly subscription for Santander bikes - worth it?

I recently found out that TfL does monthly subscription for the bikes I also just found out that now they also do e-bikes. https://tfl.gov.uk/modes/cycling/santander-cycles/what-you-pay?intcmp=2315

Anyone use this subscription is it worth it? Are the e-bikes even readily available? Also what’s it like to use as a commute because it seems a bit unreliable in the mornings and evenings unless you are there are the crack of dawn?