Still a huge fan of DeltaWalker, and this developer stays hard at work to add whatever "spit and polish" is needed to make the application the best in its class.
DeltaWalker has helped me countless times at work and I've used it while sharing out videos using 2 or 3 way comparisons when the problem "must be on my end". Using this app, I've taken the guess-work out of what happened over the course of X, whether it be minutes, days, months, years.
As an example, we had a client that was having some cisco config issues and the problem was very niche in nature. A 3rd party company was convinced that the issue was because of a config change on my side, somehow. Going through analyzing the configs (they can get pretty long) I illustrated a 3-way comparison on when the devices on the network were working, as well as when they weren't working, using 3 separate configs that we automatically backup. DeltaWalker proved beyond any doubt, that there was nothing that had changed on my end between the 3 configs that would cause such behavior.
So we had the advantages of: a stable product, ease of use to make our case, dead-simple illustration in how the data was presented to the 3rd party company, easy-to-understand legend of what was different from all 3 files, and confidence that we had covered all of our bases. The time saved by using DW paid for itself (I can guarantee you) 10 times over, at least. Time is money - and we had a total of 3 contractors involved in this particular incident.