Re: Martin RMC Bariton, is it worth it?
$1500 for a locally hard to find, recently overhauled, great playing bari sax whose sound you love (regardless of brand) is certainly a good deal. I didn't see any pictures with that link, though.
Baris can get thin in the upper octave. Could be the mouthpiece, could be the horn, could be you. If you are new to bari, you will need to spend some time getting used to a proper embouchre. You take in a bit more mouthpiece than you are probably used to. If you can , go to a music store and try a few mouthpieces out. Also, maybe you know someone who is experienced at bari and they could spend some time with you and the horn to see if everything seems ok.
That Conn Eagle mouthpiece is respectable so long as the lay is in good shape.