No experience with them. Suggest Google searches looking for user reviews.
Also look at the warranty closely.
Just spent a couple minutes looking for the Viper website. Didn't find it. 'Nuff said.
Here's the warranty for the Warn XT Series:
http://www.warn.com/corporate/images/908/65269A3_rs.pdf
Warn Industries - The Importance of Winch Sealing
The Importance of Winch Sealing
Well-sealed winches provide increased reliability, performance
Powersports winches see a wide variety of conditions including water, mud, dirt, and sand. These outside forces are constantly trying to get inside your winch - the more that gets in, the less reliability, durability, and performance the winch has.
The best way to keep the elements out of your winch is to buy a product that is well sealed. For example, the WARN RT/XT 25, 30, and 40 series winches are designed from the ground up with full sealing to provide the best protection from the worst that Mother Nature can throw at you.
WARN places eight specifically designed seals at locations where water and debris are prone to enter, allowing the winch to operate at its peak performance. Some areas, such as the winch drum, are even double sealed for extra protection. These features ensure that WARN Powersports winches are the most weather-resistant, reliable, and best-performing winches you can buy.
Maybe you've heard about companies claiming to have waterproof powersports winches. While a winch that is impervious to water sounds impressive, just how "waterproof" are these winches? By definition, "waterproof" means "...impervious to water, covered or treated to prevent permeation by water." A product making this claim should also carry a rating designating the level of protection provided against the intrusion.
A Web site selling these winches claims their products are waterproof. However, the product descriptions and FAQs only say the units have "waterproof motors." Inspection of one of these winches found the winch only had one seal in the entire product. This means the majority of the winch is vulnerable to water, mud, sand, and other debris that can cause the winch to be less reliable, perform poorly, or worse - leave you and your vehicle stranded.
When you're looking to buy a winch, don't fall for claims of waterproofing. You want a product that is designed and engineered for the ultimate in performance, reliability, and durability. Get the best-sealed and highest-performing winches on the market: Get a WARN winch and Go Prepared!