......Are they really worth it compared to standard campy or shimano.

Nope. Each has its positives and negatives. Fact is that Campy and Shimano cable kits are very, very good. They never have a fitment issue that requires a long step-down ferrule, or a different type of housing at the drop bar bend, they don't creak over time... You get my drift.

The only advantage of aftermarket "segmented" cables is weight savings over stock Campy or Shimano cables.

Yokozuna makes shimano cables so..... Yeah

What about Gore Ride On Professional? It seems my Campag SR shifting improved significantly in terms of precision and mean time between tuning, compared to std Campag cables and housings.

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Orbea Orca Gold 6430gr, Orbea Aqua, Tommasini Tecno, FM-066SL 6480gr, Kinesis RaceLight T2, Trek Superfly 100, Trek Session 88, KTM EXC-250

Thought the compression less ones were supposed to offer a more direct shift or brake pull compared to more standard cables as there is no loss in the system so to speak.

I can't notice much difference either way. I was using standard campag cables and switched to i-links for brakes and mini i-links for gears.

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Never had any problems with Jagwire.

I would avoid Gore. IME, the cables tend to gunk up quickly.

Lately I have been using Jagwire Racer Kits. They work well and the price is good. But most importantly, they are much easier to set up than Yokozuna, which also work very well.

The other nice thing about Jagwire is that you can get them in different colors, if that is important to you. My wife like the stainless steel colored cables on her bike.

I just replaced the Gore cables that came with my 2012 Red kit. They gunked up after about 4-5 months of normal use. The FD was getting stuck on the big ring. I took the cable out and it was a mess.

Running Yokozuna reaction cables now and they are great but only been on 2 rides with them. Brake and shift is strong and crisp.

Advantages/tradeoffs as always:

Weight: lighter is better, but usually means more finicky
Compressionless: Seems better to me, might only be the placebo effect
Curve radius: Some cables are better than other handling bends: the yokozuna's for instance caused my rear brake to want to shift to the side - iLinks don't at all. Depends on your particular setup if this is worth it.
sealed: for me, sealed/lined systems seem to last longer, and remain smoother longer, but not by more than about 10%

Cost: you can spend a ton on cables that are only slightly better, or even worse.

Remember though, cables are a consumable. They wear out over time, and degrade performance. A lot of people replace old worn cables with new ones of a different type, and proceed to sing the praises of the new cables...when they likely would have seen similar improvements with just putting a set of new no-name cables on.