I think people should look into CurrencyFair instead of Transferwise (or at least seriously consider it).
TW charges a flat fee only up to 200 GBP converted, then it is 0.5% of the amount, whereas CF charges as low as 0.30% (can be 0.15% for you) if you use the marketplace (i.e. offer your own rate and wait for someone else converting the other way to take it).
CF charges about 3 Euro for the external transfer itself, which can be negligible in larger amounts. I don't know how much TW charges for the external transfer itself.
Here it is straight from the site:
"When you exchange with other people, the fee is only 0.15%. Each customer in the trade pays an average of 0.15% giving 0.3% in total."
If you use the instant conversion in CF you get either 0.40%, or the 0.50% you get in Transferwise:
"When you exchange with CurrencyFair, the exchange rate fee is 0.5% (0.4% for the main currency pairs)."
Refer here https://www.currencyfair.com/feature...exchange-fees/
As far as I understand the actual rate you get at either place is not guaranteed to be the "mid-rate" as both work on a "peer to peer" system. If TW has a significantly larger userbase you may in general get better rates despite the higher fee.
Right now, using the calculators in both sites, I got 30000 CHF giving:
33740 USD, in TW
33748 USD, in CF (this is not using the marketplace, where in principle you can get a better rate).
It is not a big difference I guess.