Nice, very nice ST in BLue and silver, welcome to the club. And this being a first build I wonder where are you gonna go from here ....
As for the ride you are in for a surprise me thinks. I ride all kinds of bikes: from a mostly original 1991 rigid Stumpy to carbon fibre 29er suspension rig and all vaiations in between. But nothing, nothing compares to the feel of my Dekerf ST.
The first time I ride it it after a while is always the weirdest sensation. Notably on hardpack or tarmac I notice the rear end, it takes getting used to, again. But then I hit the woods and that rooty technical climb, flowing singletrack or now the jagged frozen tractor tracks and any thoughts just disappear. I just go with the flow and the sensation that endures is one of instinctive handling and absolute confidence. I love it.
Do you know what weight spring you have in the mechanism and if it was serviced (lubed) regularly?
Enjoy!!