Well, a quick search for "problems with Spyre brakes" and the same for "problems with BB7 brakes", both bring up plenty of results. As you would expect.
At first I was underwhelmed with the braking performance (BB7s). Not rubbish, just not as good as V brakes I was used to, or even the much maligned drum brakes on a Carrera Subway 8. But not like - "wow, disc brakes are amaaazzziiinnnggg"
I am sure it was because I initially had "modern" Shimano STIs (Sora). When I replaced them with "old" Shimano STIs (Ultegra 6510s), there was a dramatic improvement. I think this is because Shimano changed the brake cable pull on road levers, around 2008, if I remember correctly.
Now I can lock up the wheels easily from the drops, and with a little effort from the hoods. Though obviously I haven't spent a lot of time trying to lock up the front wheel, as I don't want to end my modelling career. But the brakes do what I want. After all, if you can lock up the wheels, they're powerful enough, yes? "Modulation" seems good. I know how to adjust them. They squeal a bit when they're wet. But my experience is positive. I don't feel there's any need to change them.
I'm not going to redo all the research I did before. So from memory the problems with the Spyre were a poor cable clamp system, water and dirt ingress causing corrosion, and perhaps flexible calipers.
Cheers.