I've been wearing this particular boot since before they were Viper II.  I like the comfort, the air sole heel may make my foot feel better.  They don't wear well.  The last pair I bought and am currently wearing cracked over the left big toe about 6 weeks after buying them.  The sole typically start tearing off after a few months.  That being said, I still buy them because I don't know of a 6" boot made by anyone for this price and have eyelets instead of hooks at the top.

I'll keep buying them, but I wish they were made better of there was another boot maker that made a comparable boot that I can find.