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I wish I'd bought track not circular.. that said I've got a lot more adept at being precise with the circular in the time I've owned it, even without a track. (I haven't done anything requiring super super precision.) Have contemplated a (universal?) track but never been fussed to figure out combatibility.
Given the cost of materials if you're doing anything significant the cost of a track saw gets eaten up fairly quickly.
Having used a circular saw i know it's not for me for precision work and would much rather a nice track saw and cheap circular.
I've got to renovate a while house, inbuilt cupboards etc and do an apartment from first fix up so things will get good use.