Seeing as there are no other Precision 1 threads around - I'm here as a necromancer to say that I have been absolutely loving my 1s and LCD 2 combo for 3 months now.
I'd originally ordered the 1 through a local distributor but there appeared to be some delay in delivery and they upgraded my order to a 1s at no extra charge. Fine by me, though I still prefer the 6.3mm output as the XLR out sounds a bit muddled in comparison.
My setup: FLAC -> Foobar WASAPI event -> Jdlabs ODAC -> Precision 1s -> LCD 2
If I had to sum it up in one word, the LCD 2 + Precision 1s combo = natural. It's a balanced, neutral and superbly well articulated sound - liquid without losing clarity. The bass is full and textural. The mids and vocals are present without being in your face about it. The treble is precise and never harsh. There's a here-ness to the presentation, the music envelopes and engages you and keeps you in suspension of belief because everything is really real.
I may be expounding on the qualities of the LCD 2s and that just goes to show how neutral and un-coloured the Precision 1 is.
With the LCD 2s, high gain mode is the obvious and only real choice quality-wise, albeit at the expense of volume control range. For example, 3 notches up on the volume is easy listening, 5 is moderate, while serious auditioning at loud levels can be had at 8 notches and above. Suffice it to say that there's enough power there to cause serious damage to both ears and phones.
This is my order of preference for amps that I've listened to with my LCD 2s, disregarding those that were woefully inadequate:
Precision 1 > iFi iCan > Objective O2 > iFi Nano iDSD as an amp > La Figaro\Dark Voice 339.
I would love to listen to a Burson Soloist or Violectric V200 in comparison but I'd wager that there won't be too much to separate them despite the price gulf. I'd most likely switch my cans out before switching out my Precision 1. If at all, it may be that I finally get tired of trying to make sure that my playlists are of a uniform dynamic range and sound level, since it can get jarringly loud from one song to the next.