I was thinking about reviving a thread like this but didn't see this one. I recently was given back my old Shuffle and started using it again. Posted a little about it in another thread but had to stop but had to stop to avoid derailing it. Didn't really like the Shuffle when I got it because I needed something for a full work day and I change my mind about what I want to listen to a lot and never got into random playlist. At the time I also hadn't noticed much special about sound quality because I didn't have any decent headphones.
So lately I've been using it for short walks or as my bed rig with my HD555 (re-terminated and cable shortened). It still amazes me to have so much sound coming from such a little device. The shuffle has become my new way to audition my latest CDs or music downloads because its perfect for just listening to certain albums without having to put them on the Nano. The headphone jack on mine has minor issue, the USB cap is missing and its a little scratched up but still works great.
It seems weird to me that it doesn't support ALAC or even AIFF but can play WAV files, but I would rather fit more onto it with AAC anyways. It even plays true VBR encoded files encoded at higher bitrates which are a nice compromise and I'm sure its over kill but sounds great. I don't have an encoder that does AAC CBR higher than 320 but that seems like a waste of space anyways and my shuffle is only a 512MB.
Of course there is some hiss with my Triple Fi 10s but I don't think I minded it too much when the music was playing. Maybe I will listen with these later today to see if I'm wrong because someone said they were a horrible match but last week when I tried, they sounded pretty good to me when songs were not too quiet or paused. :)