A tale of brake calipers.
When I built up my Basso 'Frankenbike' with components I had lying around, I didn't have any spare calipers. On other bicycles thoughtfully assembled by me I had chosen Shimano each time - 105s on my son's bike, Dura Ace on my race bike and Ultegra on my sportive bike - because they are trusted, easy to set up and, with Swissstop pads, I had no qualms about descending col d'Izoard at 60mph. However I was tempted to try something different, lighter and if they turned out better than Ultegra then I'd consider swapping to my sportive bike. But I didn't want to spend ridiculous money.
I waited for a week and happened to check again to see that the price had been increased by 25%! They also had a pair of gun metal colour showing in stock and I hadn't received a courtesy email. I telephoned them the following day and asked (politely) for an explanation. Apparently the gun metal ones had been a customer return and, after a quick check with the manager, I was offered them at the original price. Seize the day.
The verdict - less than 200grams, not so easy to set up, the fittings are a bit fragile, the pads take a few 100km to bed in and I have had a few wet-weather moments. Would I descend a mountain on them (even with Swissstop pads)? No way! So they aren't getting promoted to the sportive bike.
What could go on my Van Nicholas Chinook sportive bike though? Coincidence/luck perhaps, but (prior to Lent - I promise) I bought a pair of used white TRP 970SL calipers for a good price.