You get plenty of space for your first modules. The sliding nuts are a bit annoying. Plugging any bottom row module in with an occupied top row is difficult, requires more often than not removing a top row module to access the power plug.
I was able to add 60mm modules in the bottom row, would not do this on the top row.
Like most Behringer products, it's alright for the price. It arrives packaged in a bunch of plastic foam, wrapped in more plastic.