esprit

Is there much difference between the BARI Esprit and the BARI Esprit II mouthpieces? According to this link, they have square chambers. http://cavanaughcompany.shptron.com/p/esprit-ii-alto-saxophone-polished-finish?pp=8&pp=8 I noticed that the "Esprit" came for several Saxophones, Alto, Tenor...

I just bought a cheap curved soprano from ebay and the mouthpiece that came with it looks (and plays) like it was made from the tires of recycled matchbox cars. I've been doing some checking on inexpensive mps' and have narrowed my search down to 2. The Bari Esprit and the Rico Graftonite B7...