Old review, share with you..
I have both SLO for 10 years and PWE EH3 for about 4 years, now I played more EH3 than SLO, below are the advantages I thought of this amp:
1. Great master, great for practice at room level, but can also be ridiculous loud.
2. Awesome clean, can be sparkle clean or fatter sound like Marshall, fast attack finger response.
3. Each ch has individual 4 types frequency switch, for OD can sound really solid, but also can make it has slightly shimmy effect on the top end.
4. I have to said the 2CH can easily compete with SLO's lead ch, but more fun and more articulate sounding than SLO. You will experience similar vide while playing both amp together, they both react direct, in your face with really organic feel, you can hear every stings ringing clearly when strummimg.
5. Very juicy 3ch, bit darker than 2ch but great for soloing, sustaining singing tone.
If you cant get the good sound out of EH3, probably because at the rear panel there is a secret "Decelerator" which you should look at into it more detail. When you turn it all the way down, it act like a Marshall type plexi sort of sounds, narrow, tight, quick response of how you play. But once you slowly turn it way up, the amp opens. It gets bit lazy, like sitting back, you will feel the amp starting to fill up with energy, but at the same time you might lose the immediate react of the finger-string feel. The tone will be fully exploded, fatter low end, standing out mid frequency, you will need some time to find the best spot for your playing condition.
Great tone with awesome feel, really fun to pay, super underrated amp brand.