Good looks, reasonable weight, sturdy construction, all the available features, along with the low price and Thomann's reliable services, the whole deserves a 5 star rating.
After reading the manual, operating the amp is quite simple and intuitive. Not all effects and rhythm grooves are of great quality but that's nothing new with equipment that comes with loads of features and presets. I wanted a practicing-jamming amp, and when with the SD 30 I get a looper, a drum machine, a tuner, enough good effects and rhythms that can be customized, all out through a clean, noise free speaker, well... I got what I was looking for and more. On top of that ( the cherry on top of the cake) ,the additional purchase (not included in the amp's price) of the wireless foot switch was a really good idea...