tenma 72-3055

Buying a Tenma 72-3055 oscilloscope 2 channel 20 MHz which looks identical to a Goldstar OS-9020A; happy to have found the Goldstar manual on AAC. Any experience with either brand of those models? I also have a Hitachi V-212 2 channel 20 MHz recently calibrated by Tektronix. Thanks for any input.