It can be a trip of a lifetime! I guess it would depend on who you go with and what hashkafa they give over – but this is something WELL WORTH EVERY EFFORT! There is alot to do in that area, so many keverim.. rabbi pesach krohn does such a trip, it’s $$$$$ but i really think it’s worth it!!!!!! If you can – go for it!!!
What you gain – well for starters you’re praying by lots and lots of keverim.. In their death they don’t have the bad of this world and are EVEN GREATER than they were in their life!! And they’ll take you’re prayers up for you to G-d..
One can gain so much from such a trip (prob only if done in the right way, with right people etc) .. Such as, an appreciation for being a jew – some of the stories you hear about what people did in the camps are incredible!
On the flip side – there’s no choice. These people in pre war europe went so far that G-d had to bring them back.. There is justice in the world.. G-d is making sure of that..
… can tell you more but for now this is long enough!! Lotsa luck!!