Fully agreed. I stopped considering this practical in any way when I read

> 3*4+5 is 27

I'm sorry but if your calculator does not follow standard mathematical rules for operator precedence then I'm out. But the space issue takes it to another level.

I also get it, it derives from APL which is right to left and all operators have same precedence but it's just so far from practically usable for normal people... there's a reason noone uses APL today. And sure it's just a plaything but seems weird to even create apps for iPhone, iPad and Android and a logo for it.