You mean Turbo G (108Mbps)? That's what I had with my DG834GT before I got the WRT54GL. It was OK, but the wireless signal strength is tweak-able in the WRT so I actually get better coverage from that than I did from my turbo G router lol
I'm not 100%, but I'm sure I read that with the right wifi adapter you can turbo G the WRT54GL ("afterburner" on Tomato, or something?)... Maybe someone can clarify.