The Walkthing would probably be OK for some purposes, though I haven't used it for very long. The controls are easy to figure out and functional, it has bass boost, a lock switch & jacks for a line out as well as AC. It comes without any accessories except the normal cheesy headphones. It doesn't read MP3 tags, though I don't particularly miss them. It has only hiccuped on me once. But after less than an hours play the unit began to develop an annoying mechanical low whistling noise while spinning around. In other words, it would be pretty lousy for play at low volume play, especially with speakers instead of headphones. Still, I think I'll keep it for use in my car with a cassette kit from another portable, since that is already a noisy enough environment to mask the whistling, hopefully.
The MP3 Boombox is another story altogether. It is just about useless as an MP3 player, unless you are only planning to listen to "books on tape" and have a high tolerance level. It clicks to catch its mechanical breath every 10-45 seconds even when just sitting on the shelf. You can almost continuously hear the distracting, annoying low grinding noise of the player as it tries to spin up and down. The volume doesn't get very loud, but you can't even use all of that without distorting the sound. There is no headphone jack. The radio antenna telescopes all the way out to about 8" and gets proportionally quality reception. That said, it seems to play conventional CDRs pretty OK. I haven't tried it with CDRWs. However for $40 you can buy a much nicer boombox, perhaps with a cassette unit as well, perhaps even from a retailer with a more savory reputation than Target.
Target has a crummy 90 day return policy for electronics with a 15% restocking fee. Koss has a 90 day warrenty against defects in materials & workmanship (how about design?) provided you ship the unit to them in Hazelwood, Misery.
Both units will apparently handle MP3s with bitrates of up to 256k, but not WMAs.