I've done about 16Mm with my TRP Spyre's now, and had you asked me 2 weeks and 2Mm ago, I'd have recommended them with out hesitation as being excellent.
However, the last couple of weeks has changed this slightly.
The stock pads that come with the bike are much better than any after market pad I've tried so far (nuke proof and uber bike so far). Despite bedding them in, the nuke proof pads I put on just before RatN, were pretty useless. Things improved a little once I degreased the rotor at 860km, but they were never great. At about 1450km, I backed off both pad adjust screws, loosened both bolts holding the caliper, grabbed a big handful of break lever, then tightened the bolts, then adjusted the pad adjust screws, effectively doing the standard procedure when you fit the brake. This helped a little, but again, not great. I basically did the whole of RatN with only a front break. Limburg was rather more exciting than I'd like...
Until I fitted the new pads, they have been brilliant. You need to know to adjust the pads as they wear, but that's really easy if you carry the right tool (I carry a 3mm allen key just for this).
J