Is this upgrade worth it?

Second the above as, the Electros you have are good units anyway: it is not evident that they're flawed vs. the ML.

Third that. That should be enough to pass on that offer. Keep hunting, you'll do better...why not post anew and be more specific as to your needs or what you are missing in your present rig. You'll get the amp/amps to look for...IMO..warren :)

OTOH, a ML-333.5 is a true upgrade path from the #333 to the #336 although not
identical. IF THIS IS WHAT HE'S SELLING, it might be worth consideration- supposedly the ".5" upgrade was a serious attempt by levinson to add life/musicality to their austere (read- somewhat analytical-sounding) 331/332/333 series of amplifiers, using much better circuit boards and parts. in addition you'll be getting 300W/channel. again, just be sure that's the "upgrade" your friend is referring to, and not just new caps.

Having heard both, I'd have a hard time going ahead with the trade. I like Electrocompaniet, and have nothing against ML, but this sounds like a sideways move.

electros are great