I am not so much a fan of the 'reset' button, because most makers that DO implement it make it so that it restarts the bar IMMEDIATELY you press it, so your timing has to be extremely precise. But it sure comes in handy for those occasional 3/4 bars in a 4/4 piece that don't involve a fill. I just wish there was some way to tie it to the timing of the arranger, at least in whole beat increments. Something like the way the multi-pads work on Korg's (they seem to run in the background, so it doesn't matter when you kick them in, they still sync up).
But this is a somewhat different feature to the 'Half-Bar Fill-in' button that makes country fills a LOT easier...
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An arranger is just a tool. What matters is what you build with it..!