Quality, size and price. Everyone thinks everything ADA is outragously expensive, but the mini series is not that bad. The frameless edges are nicely beveled, silicone bead is small and straight, and the clarity is good.
i really wanted one of thoose to try a pico reef, but two things stopped me
1. they dont sell them in the uk
2. a pico reef in that tiny thing would be rock solid to keep alive
but for freshwater tank they look cool
because of the shape of the tank i would advise either a nice open hillside style or a grassland style, imo dont think they would work well with dense planting