Here's a website that's an SPA https://preactjs.com
I don't have an exact page count, but I was able to find 15 pages from browsing around.
Here's how many pages various search engines have indexed using the query "site:preactjs.com"
Google: 17 Bing: 6 Yahoo: 6 Baidu: 1
One of the Google results is an error page, but it presumably can't be de-indexed automatically due to there not yet being a way of declaring a 404-equivalent in SPAs.
I've also read (I can't recall where) that Google has a latency of a few days when it comes to indexing SPAs compared to server-rendered apps. This may not be a problem for you, but it's worth knowing about.
I think Jason Miller, the Preact developer, re-tweetet the article about SEO & SPAs a few days ago.
But, because of progressive enhancement, I would using SSR on my next project anyways.
But there are public websites with a high degree of interactivity (such as social networks, or ecommerce sites) for which SEO is a huge concern.
Yeah there's a lot of FUD about how google indexer works, needlessly IMO
As far as I know, all major search engines are evaluating JavaScript client-side and index the resulting html, only a chinese one had problems with SPAs.
There was even a site from Google, where you could enter a URL and see how Google sees the page.