In reply to joe.91:
I have had 3 or 4 pairs of the originals. They used to be my go-to shoes for steep, edgey trad and sport.
I loved the security and support, and felt like I could stand around for hours on small edges.
I once tried a resole in XS Grip and personally didn't get on with them. I felt that they lost more of their magic edging security with less of a gain on smears.
I've now transitioned away from boostics (tried the new ones once) and tbh can't see past Instinct VS for most things except proper trad where it's new TC Pros. Basically I feel that the instinct VS does everything the boostic could do as well, is comfier (the boostic used to give me big toe joint pain on long routes) and better at smearing.
If I need better sensitivity it's VSRs.