I'm looking into different headphone practice amps, and I wanted to get opinions from people who've tried various brands like pocket rocket, fodera private practice, TASCAM, raven, etc.

Love my Cafe Walter from BassNW.  No frills, no tricks, just YOU.
 
C-Ya......wayne

looks cool.  i also wanted to note that i'm looking for one that is portable (battery powered) and hopefully has an input for my mp3 player.
 
-devon

fodera makes a pretty good one.

The Cafe Walter meets both those criteria - it has a mini-headphone input with separate volume control and can run on two 9V batteries. I've got one - sounds great! It's more of a true sound of the bass unit - doesn't color the sound, perfect for an Alembic!
 
I also had a Fodera at one point, but I think there must have been something wrong with it - way too noisy. Plus it had RCA plugs for the CD player input - not nearly as convenient as the Cafe Walter.

I just use a boss micro br. It plays mp3s' and has looping and
slowdown features I like, but it really doesn't sound that good.  
 
It also can't transpose pitch, which I would like to be able to do
without affecting the speed. I'd like to be able to go up or down a minor third or so.
 
Does anyone know of an all-in-one that will power headphones, has
simple guitar effects, has looping (where you place A and B marks and
it just plays between A and B over and over again), will do real-time
speed adjust without changing the pitch, and do real-time pitch adjust
without changing the speed?
 
I would like for it to be able to play .wav, .mp3, and .ogg, but any
of the three would be ok.
 
Todd.

For simplicity and low cost I like my Fender unit.
No frills just on,off, volume.
Chuck

I have a little Mark II and it doesnt have a headphone jack. Does anyone know of an external headphone input I can use with my head?

Here is one I recommend:
 
https://www.carvinguitars.com/products/single.php?product=H400

not very portable is it....

not at all

I use and would recommend a Korg Pandora.  Be it a PX3B, PX4B or PX5D, they're all good.  I have the PX3B.  I also have (but don't use much) a set of Dragonfly Stethoscope earphones.  They attach by suction cup to the back of your instrument and fit into your ears just like a stethoscope.  You get ONLY the resonant sound of your instrument.
 
No batteries.....no electricity.....no muss, no fuss.....the ultimate in simplicity.

Pictures of the Pandora and the Dragonfly  

 

I went ahead and ordered the Cafe Walter.  The idea of getting a very clean sound appealed to me.  In addition, it had a simple 1/8 input, so I can plug my ipod in.
 
I didn't really need anything that did anything like slowdowns, pitch, etc.
 
I've seen the dragonfly.  Very interesting.  Talkbass has a deal where if you contribute a certain (reasonable) amount, you get one of those for free.

juggernaught wrote I've seen the dragonfly. Very interesting. Talkbass has a deal where if you contribute a certain (reasonable) amount, you get one of those for free.
 
Yup.  That's how I got mine.