QUOTE (fierljepper @ Jul 15 2008, 11:52 AM)

Pertaining the Stagi
Is the sound poor? is it quite different than the Jack?
Is it the responsiveness and/or action of the keys?
Are the extra 18 notes not really so meaningful?
Best regards,
Rick, West Chester, Pennsylvania
I started on a Stagi and then got the bug and moved on to (several) vintage Wheatstones. The Stagi served me well for about a year while I learned where the buttons are. Sound varies considerably between makes-- the Stagi was much more "accordion" sounding to me, though still single reed (so none of the wetness of tuning which I rather dislike in accordions). My stagi was in concert pitch and generally in tune, so I could play it with others. My first Wheatstone (a tutor model from 1851) had rather leaky bellows and was far enough out of tune to bother other players. Since refurbished by Button Box, it is now one of my parlor instruments (too soft for a session, but charming in its own way).
The Stagi was much larger, heavier, and stiffer than the treble Wheatstones I now play. My thumbs got tired if I played it for very long. While I was first learning I found its action and responsiveness adequate. Several of the dealers do some tweaking of the tuning and action to make their Stagis predictable and improve their playing characteristics. I hung on to mine for a few years to play in situations where I didn't want a more valuable instrument--- the annual pool party for my ECD group comes to mind.
I doubt that you will miss the higher notes which are missing on the Jackie. Most tunes don't use them. It is only in the last year or so (when I started trying to play the Mathematician, a hornpipe by Scott Skinner) that I have found need for the top of the instrument.
The Jack is a baritone, so it is an octave lower than a treble. I have a baritone (from about 1849-- nickel silver reeds in hand cut shoes) and I love the sound. If you get the chance, try both a Jack and a Jackie so you can see whether you want the baritone or the treble. Fingering is the same.
I haven't played either a Jackie or a Jack, so I can't do the comparisons you ask for, but they have gotten good press here as decent beginner instruments, particularly considering price.