The disappointment I had in the Jot was it was a bit bright to me when most keep saying its neutral so I tried my HD800, T1, HE560 and HD700 on a friends Jot and couldn't listen very long since the treble in all 4 headphones was quite harsh and glaring to me, pretty much the same sound I get when I use my Asgard2 to drive these headphones. I did try the HD800 and HE560 balanced also and the sound was pretty much the same bright harsh sound.
The Jot was actually quite good with the HD650, SRH-1840, LCD-2.2 and EL-8 so its a good/great amp, just not for what I wanted to use it with. I usually use a Lyr2 or the headphone jack of my UD-301 with my LCD-2f but these days I don't use my LCD-2f much since I've build a Grado clone using a Ypsilon R1 driver that is more dynamic, better extended with smoother highs, and while it doesn't go as low as the LCD-2 it does have more punch and is nice and detailed. And the 2 best things about it: doesn't need an amp to sound great and its super light so after a few minutes I don't know its there on my head.
@biggbenn74, looking forward to your impressions/comparisons in the future
@drwlf, you are so right about trying to make a lower cost product match a higher price one, its why I love Grado's and the alternative drivers that are being released these days