It is pretty similar to Vault, I personally think SURGE tasted better myself, had a aftertaste with more of a bite than Vault. The smell is almost identical though. I also preferred the bright green color of SURGE, made it seem a lot more unique. I think getting SURGE back for a limited run would be cool, especially if Vault is still around to try them side by side. It looks like Vault is fading though, and SURGE could be brought for a limited nostalgia run, similar to the "throwbacks", "heritage" , "retro" and "back by popular dew-mand" drinks.
Limited run. Retro. Does it make sense for Coca-Cola to have three "Dew" type drinks in their coolers? Especially after Surge and Vault pretty much failed and went tits up. Last weekend I took a quick trip down I-81 from Pennsylvania to Roanoke, Virginia. In the soda coolers I found loads of Mountain Dew in many flavors, some stores with multiple racks of Dew. Mello Yello had two or three facings, sometimes including MY Zero. In some places Vault had two facings. I even saw Vault and Mello Yello in the same cooler. I saw no Red Blitz.
Surge won't be back. Coca-Cola can barely sell any version of a Mountain Dew type drink.