What was your favorite dial-up modem?

US Robotics Sportster ISA 56k modem

http://www.recycledgoods.com/media/catalog/product/cache/1/i...

I had pocketable computer, modem and a coupler. https://goo.gl/photos/oedTZeDQNxf5azsb7

Yes the modem has XJACK. Other PCMCIA-modems had ugly proprietary connectors.

USR Courier 56K V.Everything (tm)

The thing which made my mind soar at the time was the fact at one could flash it to increase its capability from 28k to 33.6k to 56k.

It's a toss up between the US Robotics Courier HST Dual Standard and the Courier v.Everything