DDWRT is good if you want to do lots of configuration. As for stability it's a little hit and miss.
My first experience was rock solid and absolutely amazing. It never crashed or anything.
My second experience was on dual band & I find 5ghz performance was always a little flaky. Sometimes not connecting at all. 2.4 ghz wise it's fab.
Stock firmware on my netgear wndr3700 gave better wireless performance by a long long shot vs DDWRT which was much worse. Even after 'tweaking' and setting the tx power to scary high levels.
It's all dependant on the router. On a d link DDWRT was much better.
75Mbps seems about right - in fact it's very good. You sync at 79999 but there's overheads etc so you're spot on there.
If your current setup works well & is very stable why mess? I messed recently and wasted a tonne of money. I got the WNDR3700 for around £100 and found it's performance no better than the sky router which was free. In fact I switched back, sold the netgear and accepted my losses.
I regret doing it as my setup before was fine. If we didn't get the 'urge' to 'upgrade' (when things are actually fine) we would all save a tonne of money! Back to my old setup now and v.happy.
Edited by ukhardy07 (Mon 03-Dec-12 16:07:44)