I'm really liking it so far except for Link's boomerang. I'm a Link main, and have been since Melee, and Link is better in many ways, but the boomerang is not one of them. The animation is wonky and where Link's hands are when the boomerang is released and where the boomerang is actually released don't match up. The return of the Ocarina of Time design doesn't fit with the leaf/other Gale boomerang effects, and the boomerang is much less effective now. It doesn't fly far enough even with a smash-B to properly poke your opponent from range and, when you are in range, it isn't strong enough to actually stop them in their approach. The added speed means it spends little time in the air, thereby removing it as an option to cover a retreat from an approaching player. The reduced range means it can't reach nearly the same amount of angles and areas the old boomerang could, which also limits Link's options. The boomerang is not an improvement. Other than that though, I'm liking Link's speed buffs, but the boomerang is impeding me from calling 2.6 Link an improvement.
As far as other characters go, I'm really happy with them. Ganondorf is my secondary, and I'm really liking his new uptilt. Captain Falcon, I don't know why, just feels better. It's like he's 1:1 with Melee now. I would have liked to see Ness buffed a little more, but I'll take what I can get. It's going to take me awhile to get used to Lucas' Brawl Aerials, but other than that, Lucas feels much better. It's like he's slippier while being more precise. I'm also liking Ivysaur's changes. The rest of the characters I play (Spacies, Marth, Ike, Lucario, Pit, and Toon Link) feel the same, although I've yet to really try out Lucario and Pit yet. Meta Knight is a good character, but he's not really my thing. For stages, I'm really liking Lylat Cruise now that it doesn't tilt. I don't understand why though you changed Skyloft. The Hyrule Field theme doesn't fit the stage nearly as well as Ballad of the Goddesses. Also, much of the time the time you play on the stage has simply a sky background instead of the actual town like the old Skyloft. A minute or so in the platform clearly clips into a building.
Overall, 2.6 is a good update, but Link's boomerang and Skyloft could use some changes.