What do you guys think of this battery??

Very nice!! Id run it/use it

Could i use this to replace my main battery in my vehicle?? As well as adding another one of these somewhere else??

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I wouldnt use for Main starting battery,but For add- ons I would,Yet,You are up where it gets pretty cold..and deep cycles are needed.Id ask about it from a local Auto store/battery facility

Could i use this to replace my main battery in my vehicle?? As well as adding another one of these somewhere else??

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hell yes, as long as it fits up front

you can get alot better battery for that price like kinetik or xs even the smaller ones are better than that battery the kinetik 2400s are on ebay for 20$ more!!

kinetik battery | eBay

you can get alot better battery for that price like kinetik or xs even the smaller ones are better than that battery the kinetik 2400s are on ebay for 20$ more!!
kinetik battery | eBay

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OP lives in Canada.... shipping would be an issue buying from US seller on eBay.

Unless your going to isolate it you need to run just the one until you have the money to buy an identical one and try to do that soon so the battery's are roughly the same age.