I'm using them, only wired up a dozen or so, but impressed so far. You can use y or splitter cables to change multiple pairs of points from one output - such as a crossover, or scissors crossing. Makes them even cheaper, just means setup is a bit more of a faff as all servos have to have the same limits.
I've glued the aluminium channel to the board rather than screwing, allows a bit of fine adjustment before it sets. Not had any issues so far.
I bought all my servos/leads/switches from AliExpress, took a few weeks, but ridiculously cheap.