RSS feed plain text only

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Yes RSS feed is plain text in XML format. What you will see after clicking might depend on the browser.

Mine asks me - which feed reader to use.

The important part is the content-type header that gets sent with the content. This is how the browser knows to treat the content like an RSS feed. If you check the headers sent with the feed XML, you should see the following:

The server is telling the browser that the content is application/rss+xml. It is up to the browser, however, to decide what that means. If you are using Firefox, for instance, you should see a prompt at the top of the page asking if you would like to view the feed in your favorite RSS reader.

Depending on which browser you use and how it is configured, you might end up seeing the plain XML.