OTOH, most other arrangers don't HAVE to have upgrade packs (how much money you got in VSTi's installed, yet?) just to sound decent...

I like the idea of 'open' arrangers... but only if it is 'closed' at one end! If it is open at both ends, you know how the money is going to flow...

Look the price of a decent VSTi is hundreds of dollars. Get one for organ, one for drums, one for pianos, one for basses, one for synths, one for GM compatibility, and then loops galore for the Qranger, you'll end up doubling the ptice BEFORE it is even comparable to a T3.

My imagination may be limitless, but my pocketbook certainly isn't I haven't spent dollar one on my G70 since the day I bought it. IMO, it STILL sounds better OOTB than the MS...
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An arranger is just a tool. What matters is what you build with it..!