The TRN STM is a budget CHIFI brightish U-shaped hybrid that offers 3 tuning nozzles to finetune the sound signature. It has good price to performance ratio and good technicalities for the price. A nitpick would be the common artificial BA timbre for acoustic instruments and thinner note weight. Don’t be expecting a tour de force for the price, (and keep your expectations in check), but I think its very decent value for 20ish bucks.