REX: The World's Smallest PDA!

When most people think of personal digital assistants, they remember handheld devices with touchscreens or keyboards not too different from today's smartphones. REX pushed the boundaries of what an information organizer could be, but was it successful?
Sources:
Casio Digital Diary photo: commons.wikimedia.org/wiki/Fi...
REX desktop dock photo: www.applefritter.com/content/...
"Small Wonder," PC Magazine, December 2, 1997.
Electronics Boutique catalog scan: huguesjohnson.com/scans/EBChr...
Radio Shack organizer photo: americanhistory.si.edu/collec...
REX in packaging photo: www.ebay.com/itm/255686800109
"REX: The Next Generation," PC Magazine, September 22, 1998.
"Xircom Buys Rex Organizer and USB Businesses," techmonitor.ai/technology/xir...
"Smallest PDA Gets Bigger Inside," PC Magazine, February 6, 2001.
"Xircom unveils world's smallest PDA," InfoWorld, November 27, 2000.
REX 6000 photo: / 1154094719150018561
"Motorola nets itself a Starfish," InfoWorld, July 20, 1998.
"Intel buys modem maker Xircom for $748 million," InfoWorld, January 22, 2001.
"Intel discontinues Rex organizer line," web.archive.org/web/200202202...
Citizen DataSlim-2 box photo: static.mercdn.net/item/detail...
Citizen DataSlim photo: aucfree.com/items/l515042610
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Music by Epidemic Sound (www.epidemicsound.com).
Intro music by BoxCat Games (freemusicarchive.org/music/Bo....