this is a new company, their revenue history only started in 2015 from what i can find. The company 'viper' trademark was originated and registered in 2014.
As to where they are being manufactured i haven't found anything on that yet. I would be very interested in finding this out before i made a definitive decision on a purchase from them. Factory and dealer support are critical to machines serviceability in every case on any brand.

If you look on their website they are not very forthcoming with any company history, probably because they do not have much of one yet being they are very new in the lift truck industry.

Hopefully they are a good brand but they are just too new to have an honest opinion on them. You should really find people that have purchased them to get a better idea on 'how dependable' they really are and if its worth the cost savings you see on the front line.
Remember you get what you pay for, the hyster brand is a reputable brand that has been around for decades and specializes in large lifttrucks. Yale, caterpillar, taylor and kalmar also sell comparable units of the same capacities.

Not much history on viper so not much to compare.

If you want to give them a shot contact them and see if they offer a 'demo program' so you can test them out before you buy.