I've used them in megamek. They are quick, and can mount impressive firepower. That said, you need to treat them like hover units, use cover, and if they land, it has to be behind cover.
The Hiryo is a pretty good battle armor taxi, but it has to land before disembarking, so make sure to take cover when unloading.
The Nisos has great weapons. Most useful in the open, or canyon networks (since it can span gaps that even hovers can't)