I use "+" in my Products Model on most of my products:

Example: Products Model = GFPM+9:

ZC : Widget 1 - (GFPM+9)

Paypal Express drops the "+" in processing/emails to customer:

PE: Widget 1 - Item#: GFPM 9

My issue with this is I have other products with the same model #, but no "+" so this is confusing to the customer and to me.

ZC: Widget 2 - (GFPM9)
PE: Widget 2 - Item#: GFPM9

make sense?