Because most people end up on the Blog thanks to the character builds, I think it's fair to assume that many of the builds have been and are being played. If you're willing to share, I'd like to know a few things:
What's the longest (in terms of levels) that you've played a build by someone else?
Do you still have that character/would you return to them some time?
What about the build(s) got you to play them for so long?
If you haven't played a build by someone else, what has been your highest level character?
No need to mention which builds unless you want to. I'm sure the authors appreciate the publicity ;D. As for me, I haven't yet played any of the other builds here, but I've got a list of about 30 "must-plays", that are just waiting for me to be through with my own playtests. I'm committed to playing those builds at least to their maximum perk spread level. For myself, my highest level character is my first, level 76. He really would have benefited from being a build.
For me, reaching a build to level 50 is a damn war . I only ever do it if I am going to post a build and I need to test the guy. My highest level character was my Khajiit Shadow Warrior on my xbox. He was level 57 or something. Yeah, I've never seen those fancy Legendary Dragons of yours, nor the Ebony Warrior :(. I just can't do it. I want to start a new one. I've played many builds from the building group, but all my highest ones are my own creations :).
1) Mason's Kingslayer - Level 42
2) I still have it and go back to it every now and then.
3) It's very versatile in that you can play it in a number of ways: heavy-armored assassin; Death Knight conjurer; Archer; Vamp Lord. I love the build's special move of Slow Time x3 + Mehrune's Razor. Also, it's just plain fun to rock the fully-enchanted Daedric armor by level 20 with zero perks in smithing and enchanting. Gotta love that Atronach Forge.
4) My build: canon Nord Dragonborn - Level 58. Still have it saved.