I still have my WRT54G around somewhere. Loved that thing. What I found interesting was that when the firmware went open demand for that model went through the roof. Wish more companies would realize that there is a demand for that market.
I had mine running for probably 10+ years but eventually started acting screwy a few years back. I went ahead and upgraded to a TP-Link and I’ve bee satisfied with it. I haven’t looked into if you can still get these custom firmwares for modern routers - but I’ve also been satisfied with the interface and the performance.
Yeah. I've had a couple of their little travel routers which are a lot of fun. But apparently you can't flash custom builds on one of their more recent models.