They are of similar quality to lights such as Fenix and 4Sevens. The problem with them is customer service. When we looked at stocking them, they just didn't meet our requirements for support. You end up being completely reliant on the dealer you buy it as they stick the dealer with all the warranty.
Fenix and 4Sevens have nice long warranties, and US based facilities for warranty work if your dealer goes under or isn't very helpful.
Price wise, they are all pretty similar in price. We offer all ingo folks 10% off Fenix and 4Sevens lights with coupon code INGO.