hi bruce initally i used the locator bolts and clamps. now i use the velcro only. i have the v2. version with new one piece cf seat. whilst learning skills i found having the seat clamped more to my liking. this helped in the learning phase having the seat stable rock solid and no shearing noises emanating from the "stressed" seat . now that i have my skillset at an acceptable level i am not inadvertently "moving around" so much on the seat edges looking for balance etc . now i take advantage of being able to store innertubes in bags inside the frame. i have not noticed any issue with stability from the seat with velcro only. sometimes my velcro strip likes to raise itself off the paintwork but i just pat it down. i guess when i transport the bike i would not trust the velcro to retain the seat pan or cushion at speed on the roof of the truck. at some stage the velcro strip will need replacing if i continue to take on -off the seat not that that happens very frequently.Eric Winn discussed using only Velcro for attaching the seat to the frame during his May 2013 Vendetta build. Are there others using only Velcro to hold the carbon seat to the frame on the later generations of Vendetta and Silvio? Likes or dislikes?