I use both WXL and Netsurf, very occasionally I use O2. I download the current Netsurf Test Build about once a month and it alsways seems to be better than before (but I have kept a list of changes). Checking back, I find I have updates to WXL in May 2003 (v1.99u1), Oct 2003 (v 1.99u7 32bit) and june 2004 (v 1.99u11 32 bit). I am not sure if I have fallen off a support list or the frequence of updates seems to have dropped off a bit recently.
As far as the browsers are concenred I like netsurf and find most thins the Netsurf can't handle WXL does but is much slower and has one or two annoying features like not covering the whole screen when maximised.