I rarely put pedals between me and my nice amps.
However, sometimes it's fun to use FX for a change or for a specific sound

I find it really hard to get pedals that don't completely wreck the tone of any good amp, even when switched off

A few have true bypass, but even then you need to be sure the effected sound is not messed up

Anywaym I feel like playing with a very light phased effect occasionally

Any recommendations?
It needs to not trash the tone when on, and do nothing when off

I could only see this brand for £40+ in the UK,
which for a Chinese brand with no reviews, no history, no anything, looked like paying s/hand BOSS prices for a new copy of an unbranded model,
so sorry I won't risk it.

In the end I bought an MXR Phase 90 Script 1974 reissue. Shame it has no DC input, but it sounds good, not too swirly, just right

Cheers
Tone