[noun] + から言うと [noun] + から言えば [noun] + から言って [noun] + から言ったら
から言うと follows a noun and names the yardstick you're judging by: "in terms of", "judging by". The noun is a criterion – price, size, experience, common sense – and the rest of the sentence is the judgement. It's often written in kana, からいうと.
These go beyond から言うと itself.
から言えば and から言って mean the same as から言うと. から言っても adds "even": the judgement holds whichever way you measure it, and it often comes in pairs.
結論から言うと, "speaking from the conclusion", is a set phrase for getting straight to the point.