I was really looking forward to Stripe implementing SEPA Direct Debit and moving away from my current provider, but at the moment the offering has 2 serious flaws compared to other services:
1) Pricing. Direct Debit usually has the advantage of being cheaper than cards, usually a small percentage with no fixed fee. I was expecting something like the US ACH fee (0.8%) or a fixed 1% maybe. 1.4% + €0.25 is pretty expensive compared to your main SEPA competitor (GoCardless is just 1% up to €2). The fixed fee makes it less competitive for smaller payment amounts, which is usually one of the SEPA DD advantages.
2) Own Creditor Identifier requirement. GoCardless allows using your own identifier under their Pro offering, but you can also use their own shared identifier as an individual or small business. One of the main advantages of using Stripe is avoiding traditional banks, but getting an ID requires dealing with them and is pretty cumbersome or even not possible in some banks, specially for non-business accounts (and they also expect to handle your direct debits, not just provide you with an ID).
It would be pretty useful information to have, since you're collecting it already.