I've only had these wheels for a week so please keep that in mind with this review. I'll post another review after I've ridden them for a few months. I ride a mid-priced gravel bike and it came with very basic wheels to keep the cost down. The original wheels were heavy and flexy. I did not weigh the wheels but the Reynolds feel so light compared to the old set, which also made the bike noticeably lighter. Less weight and added stiffness make it much easier to climb - especially noticeable when standing up. Are they the lightest? I found other gravel wheels that are lighter but I think the 1550 g is a nice balance between weight and durability (time will tell). The rear hub sounds amazing! nice buzz and both front and rear wheels spin for a long, long, time
These wheels are a bit expensive, but I got them on sale and used my reward money so not as expensive as they could be. Still expensive but i think they are worth it considering the lifetime warranty.
I forgot to mention that these things were so easy to setup tubeless - WTB Ventures 47mm using a canister pump.