Question : Newer DSL Modem significantly better than an older one??

I have a Siemens SpeedStream 5360 ADSL modem that I am running on AT&T's DSL network (measured at about 2.4mps downstream).  I'm guessing it's two years old or so.  I recently upgraded my service and got a free after rebate SpeadStream 4100B modem.

My question is whether there are any significant improvement (apart from the smaller size) of this newer modem. Is it faster?  More reliable connection?  If not, I'm probably just going to ebay the new one.

Answer : Newer DSL Modem significantly better than an older one??

Newer is not always better, and only way you find out is hookup and monitor it a while, then compare with old one. Speedstream is in market while and known good device. I would keep old one as it is working good.