Haven’t tried the P2 Plus so not the best person to answer this, but what I can say to anyone looking to get the Tender 1 (apart from needing lots and lots of power and burn in) is that I’ve never encountered an IEM that sounds so different depending on the tips and cable.
I got mine some time ago, against the advice of several people who seemed disappointed with what they heard. The variation in opinions was frankly baffling and sometimes contradictory.
It sounds beautiful now and I don’t regret my purchase one bit, but when I rolled it through dozens of tips and cables, I realised it ran the gamut from thick and soupy to honky to thin and shouty, just depending on what I put on it.
Thankfully the stock black tips and stock silver cable turned out a good match for me. The Tender 1 may have one of the most limited accessory sets in the market but Dethonray clearly chose carefully and chose well.
P.S.: Last thing to add, the blue is gorgeous and really hard to photograph accurately. Even Dethonray’s own product shots don’t do it justice.