I am using Cashila frequently. Especially for invoices below 35EUR as their fees are better than an ordinary SEPA transfer in this case.
I did not use bitbill (did not know it until mentioned above), but my quick comparison would be:
- Bitbill is more expensive (it states some 0.95 EUR transaction cost + fee)
- Cashila has an awesome feature... I get my invoice in mail in PDF or XML form and I forward it to my personal Cashila 'inbox'... they parse it and send me link to QR code (no typing at all!)
- Cashila's website looks more legit
