I have the DIY FW13 Intel 11th Gen with Fedora. I've had an overall positive experience and have enjoyed tinkering with it. My only negative with it has been the issue specific to 11th gens where the CMOS drains and eventually dies if the laptop is left unplugged for days-to-weeks at a time. On the whole Framework handled the issue well, there was no permanent fix without soldering or replacing the board. The company…
My 12th gen has issues with abysmal battery life while sleeping (not just the regular Intel 12th gen sleep complaints, but batt life varies greatly depending on which expansion cards you have on the laptop while sleeping eg USB-A vs -C). Framework has been beta testing a FW update to partially improve this since 2022 and last I checked the beta still had side effects like bricking the left USB-C ports under certain conditions.
Even though Fedora is (afaict?) the best supposed Linux distro, there's still known issues that have persisted for years like the brightness keys not working (there's technically a workaround but it breaks a different feature that I would like to use)
If the laptop as it is today meets your needs, go for it... but one shouldn't buy it assuming that known issues will be fixed later on.