Hi, Framework laptop owner here!
I love my laptop. I got it back in June (13th gen Intel) and have used it near-daily ever since. It's got a nice build quality, I like the way it looks, and the modular slots are a nice concept (though I haven't seen a need to swap out mine- I elected for 2 x USB-C and 2 x USB-A. You also need to pay attention to which ports go where because not all the slots support USB charging). I bought the barebones laptop, and added my own RAM and SSD to it which was significantly cheaper than getting it from Framework. I currently dual boot Linux Mint and occasionally Windows 11 and have had no significant issues with either, but there are a couple of little annoyances with Mint- the light-sensor to automatically adjust the brightness and the brightness keys conflict, so one or the other or both may not work correctly.
To your real question, is it worth it? Honestly, if performance is your sole metric, then no- there are cheaper alternatives out there for comparable performance. The premium you pay for a Framework is an investment in repairability and customizability- investments that may not pay off if the company doesn't exist in the long term. All the promises and commitments in the world to letting users have the right to fix or modify their own hardware mean nothing if there's no one to supply parts. I was aware of this before buying mine, so I was fine accepting that risk- after all, at one point in time Tesla was risky too but now it seems they're poised to be the charging standard for EVs- and there are a couple of higher-ups at AMD who like the concept and are invested in Framework, which means it may be around for a while. But that's still something you should keep in mind.
That said, you said you were looking for a $500-ish laptop, and are now asking about one that will cost you over double that? It's not for me to tell you how to spend your money, but it sounds like you saw a cool idea and want to jump on the bandwagon. You should be extra sure that what you're looking for fits your needs within your budget and you're not just trying to "keep up with the Joneses."
TL;DR: If you have the money, and are okay with the risk of a small company existing long-term, and it has the performance you need, then yes, I think they're good buys.