I just checked - paying 10EUR from my UK account to the EUR area takes 2-4 days (I'd need to pay 15GBP for an "urgent" next-business-day transfer) (same rate as TransferWise) whereas if I want to send 10kEUR I'd pay 250 GBP (!) for a "no-fee" (!!) transfer than with TransferWise (a.k.a. scam). Paying from EUR to EUR account (cross-border) costs about 0.1% (0.38 EUR fee to send 350EUR) which isn't too bad.
Suffice to say, room for improvement.