Awful. I paid for baggage check-in, which they didn’t pass on to the airline and didn’t tell me, so I had to pay extra, and queue twice, at the airport. I rang Opodo immediately after I checked in the baggage and they admitted they had not been able to pass it on to the airline as it was a codeshare flight, and asked me to send them the receipt for the £45 I had just paid at the airport. What should have been a simple, immediate refund of £45 took constant chasing over 3 weeks - at least 8 calls, 8 emails, and most outrageously, for me to send them my bank statement to prove I hadn’t already received a refund from them. They jump straight to demanding bank statements before checking issues at their end - they said their first attempt at a refund had ‘been rejected’ from my bank (nope, I’ve no idea what this means either). Avoid at all costs.