I like Musicsphere.
I've used Genius playlists as well.
There are ways to change the default playlists for Musicsphere but I haven't
messed with that much.
I have noticed that Musicsphere doesn't seem to care about ratings (mine or anyone elses)
when it creates a playlists. Genius seems to just immediately go looking for what it
somehow knows is popular. For example, if I tell it to build a genius playlist using
a song like "Purple Haze" by Hendrix, I basically get a very typical classic rock radio
sounding playlist. With Musicsphere, it seems much more likely to find "deep tracks"
(album tracks that radio ignores).
I've also used "smart" playlists (which are different than Genius playlists) on Itunes.
I did that most because I was unhappy with Musicsphere's "decades" category (which ignores
the 50s, shouldn't have a "10s" because the decade is too new, and lumps the 60s and 70s
into one decade).
With smart playlists I can subdivide parts of a decade into any segement if time I like.
For example, I did "class of 81" smart playlist that includes all of the years I was in
high school. Note that I straddled the 70s and 80s.
I really do like using Musicsphere for some of the moods... "calm" seems to find really
cool songs on my ipod. Some of the categories make no sense to me (edge1, edge 2, etc.)
but I can just eliminate those if I want to.
Of course, sometimes there are songs that don't belong in a playlist - but you can edit
those out manually.
There is a way to refresh the playlists. Just delete them on the itunes and hit the arrows
that look like a circle. You might want to resync the ipod while the playlists are missing
so they get cleared from your ipod.
To be clear: refreshing the playlists is NOT the same as analyzing the library. A list
refresh takes maybe 1 minute (tops).
There is some very sparse documentation in the app itself. It helps - but its far from perfect.
So if I had to rank the four playlist types available I would rank them as follows:
1.) Musicsphere (for SOME of the lists)
2.) Smart playlists (for extreme granularity)
3.) User created lists (ultimately the best - but takes time)
4.) Genius playlists (really only seems to work well for some songs)
5.) random shuffle (I hate doing this - I have way too many different
types of music from too man eras)
I have been amazed at some of the song transitions that Musicsphere created.
Those might have been accidental - but they don't seem completely random.
My only real disappointment with Musicsphere is I don't think it will ever
evolve. I think they coded it once, and will never improve upon it.