DSL has only just made it to my town, (Bloomington, IN) and that only from high priced out of town providers, so I have not tried it yet.
I have 2 seperate connections on two non-networked PC's:
1) 128K ISDN run through a 3Com Office Connect Lan Modem - the modem is great, my ISP has has some connectivity problems but once my B channels are up I can stay connected using Ping Plotter and the ISDN is then very stable.
I don't know how well the ISDN would handle large amounts of streaming data because I use my other connection for that. I would be interested to hear comments regarding ISDN and heavy data flow - whether that scenario might slow down order entry?
2) @Home Cable - this service is variable: very fast at times, slow sometimes, can not connect at times. I run QQL (quotes, charts, L2, etc) with this connection. I would not feel comfortable depending soley on @HOME.