I've got the Tango Down bipod. I've had it for a week or so now and I'm not unhappy with the $200 I spent. It's good at what it does. It fits great. Some may have issues with certain light/mount combos. For the record, I've got a Pentagon X3 and Daniel Defense Offset Light Mount and there is JUST enough clearance for everything to work properly. This was a gamble when I ordered, I didn't know if they were going to work together, but they do. The main selling point for me was no springs exposed.
At the end of the day, the Tango Down piece is a well engineered bipod. It is a great piece of kit and they will sell a metric shit ton, even at what some consider to be "overpriced". It's funny to me that people with more money in accessories hanging off their rifle than what the rifle actually cost will balk at $200 for a bipod from a company with as good a reputation as Tango Down. Are there other bipods out there that can be had for cheaper? Yes. Are these cheaper bipods as good as Tango Down? Probably. Buy what you want. I, for one, am happy with the Tango Down.