I’ve test ridden an S2 and an S3 around the Peak District. I found it pedalled well, but very differently to my Ibis Mojo HD3.
I think it depends on what you’re climbing though. On a long fire road, I’d maybe prefer the Ibis, but technical climbing, the Airdrop wins. It’s permanently supple and there’s a noticeable difference in traction.
Until the Airdrop, I hadn’t noticed that the Ibis stalls slightly on square edges while under load up hill. This was a trait that steered my away from Santa Cruz several years ago. Some bikes really make use of that chain tension when climbing to stiffen things up. I didn’t think the Ibis did it compared to the Santa Cruz I demoed but trying the Airdrop highlighted that it did, just not as much.
By comparison, the Airdrop just keeps supple, keeps providing traction and keeps doing what you need it to.
I don’t think I’ll be getting to the top first, but I think I’ll probably have pedalled more of the climb than most aboard the Airdrop.