I came to conclusion that OFX is probably dead protocol.
Bank feeds are typically facilitated by screen scrapping which is not clean way but it works without asking bank to support anything.
WaveAccounting provides bank feeds by paying 3rd-party bank aggregator Yodlee. You can see how unsustainable it is when someone is paying for your bank feeds. There are also security implications where you have to share your banking credentials with Yodlee - which is certainly against your bank rules.
The only way to have free bank feeds which work with all the banks is to simply use web-browser automation tool which will do clicking on your behalf.
I just released such a tool which can assist to download bank statement from online banking site and upload it to Manager in automated way. You have to write macro to obtain bank statement from your bank but once macro is written, it will save a lot of time.