I made my own Jumpers out of Home Depot multi stranded 12awg copper wire. Which worked quite well and were an imporovement over the Aluminum Bar Jumbers provided by Focal. Then I ran into a bargain set of Cardas jumpers which were even better, I think so anyway.
As for worth it ?? I would say yes if small to moderate improvements mean anything to you and of course you think the price is in line with others. If you want a recommendation I love Jena wire which is what I use for speaker cable. The jumpers are called the Dussys I believe. They are not cheap by any stretch.
I agree with Ncarv here- is this hobby worth it? It appears, that as a general rule, that even a small improvement, is important to most people who are into the hobby.