telescopic seat posts are nice for easy micro adjusts (allen key) so you can fiddle without wrenches- I found it was a nice way to be able to change the seat position say if I ride roads- then get to trails and lower the seat and change the seat angle- also- I ride a mtb and I find that I like the road racing seats more- I have 2 Velos, 1 is a Brodie new mtb seat, the other a road seat-
the Brodie mtb- cause of the back width, hurts my @ss after 2 hrs of riding- I put an even smaller ital racing seat on and placed the seat more foreward and horizontal level- and WOW- perrrfect.