The actual connectors that the pins of the modules slide into are all at slightly different angles, some of them are more crooked than others. Installing modules, especially ones that are next to other modules can be very difficult, it is hard to do without bending the PCB on your module. If you do it slowly and carefully it works, but I would imagine more expensive units don't have this problem. Once everything is installed, it works as it should, but I haven't owned any other lunchboxes so I don't have anything to compare it to.