I use tons of pedals but can not compare the sound of the DI-01 with any other. It is very creamy. I usually play a Roland Jazz Chorus -120 in small clubs, so I need all distortion from effect pedals. This is my pedal for lead solos if I play Eagles or even Led Zeppelin. The pedal varies the sound very much if you give it more input volume. So I recommend to use a soft overdrive before it, so you can change the sound much with the volume knob of any (soft!)overdrive. It is true that it sounds better when you use a distortion level of more then 7-8.
Reliability/Durability:
All the Yamaha pedals of the 01-series do not have the standard 9V power jacks. You can use them with batterie or use their 6-pin power input. If you are interested, I can tell you which of the 6 pins are for power input.
Ease of Use:
Yamaha made 3 distortion pedals within the 01-series from the late 70s to the mid 80s. Overdrive, Distortion & Hard-Distortion. The most common (here in Europe) was the Distortion, we are talking about. It has three knobs-level, effect & tone...so extremly easy to handle.
Customer Support:
Overall Rating:
This is - like all the Yamaha 01-pedals - a very good, low noise Distortion pedal. If mine would get lost I would buy another one quickly. The DISTORTION DI-01 is the cheapest and easiest to find of the three Yamaha 01-series distortion pedals.