It's kind of strange... we can barely get anyone here onto 76 note arrangers, let alone really want an 88, but when it comes to accordions, the bigger the better!
Honestly, if I'm going to stand on my feet for a set at a time with an accordion, a nice 48 bass or 72 tops is all I'm comfortable with. Got to admit, I get some mad money, I might seriously look into a Roland FR-1x to go with my 120 and 48 bass real accordions!
The Siwa is quite light, but still bulky... and expensive!
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An arranger is just a tool. What matters is what you build with it..!