480cc -VS- 580cc is it worthy ????

Looks are not everything I try not to be overly OCD with the looks thing as convenience has to fit in somewhere. A double tank is great if your shooting off of a bench but if you are going to carry the thing around and need as many shots as possible or for high power shooting it's hard to beat the 580cc. I grabbed up a 580 so I could use my 480 as a back up in a backpack when it was empty. That was back when I only had a 90ci tank to fill from. Now that I have a larger tank to fill from I seldom use my 480. Nothing wrong with the stock 480cc if the shot count is acceptable for you though.
 
You most definitely won't want to be carrying or shouldering a front heavy and tipsy double bottle anything around to shoot and go hunt with it that's for sure. Perfect for shooting off of a bench though.

There's a difference in overall balance with the 480cc LCS SK19 vs the 580cc since I have both the 480cc is easier to shoulder when shooting. It is an absolute necessity for full auto and semi auto especially full auto.

Unless you have a 30 caliber or larger or a semi or full auto I wouldnt normally upgrade just because of the perfect balance difference.

If it's for an Impact then you can buy the cheap Ace Care 500cc bottle with an FX valve and a washer to shim and refill as a spare swappable bottle to carry.