Not me, but I intend to start it sometime soon.
Is it any good?
Does it have shit pacing like SAO?
It's not really comparable to SAO beyond the fact that they both have a MMO as the base setting. They're very different animals with radically different themes.
Just for starters, the issue of mortality is discarded almost immediately; it's quickly revealed that people respawn as per normal mechanics, which among other things makes PKing more of an annoyance and less of a capital crime.
Rather than being locked into a VR simulation, the Log Horizon world is effectively real (it was originally a more traditional screen/keyboard MMO), and moreover, little time is spent worrying over how they were transported there or how to get back (actually, a fairly major element of that is that a lot of the players are actually pleased, because their lives in the game and in the new world are more fulfilling and interesting than their "real" lives).
Apart from a short early arc (and a later one that involves the integration of younger, low-leveled players into the realities of RL-MMO society), there's little focus on tactical-level combat. Most of the drama is centered on character interactions, politicking between factions, real problems that can't be solved by hitting them with swords, &c.
As far as pacing goes, there really aren't problems in my eyes. The only part that bogged me down was the early overview of combat arc, which ends quickly.
The characters themselves are much less flat and more interesting, generally speaking, and there's certainly not the sort of squick that SAO started throwing out with the whole "we're-not-really-sibilings-so-it's-okay" crap.
Longer term, one of the major issues which arises is that the NPCs are now sentient beings rather than programs, and that from their perspective the players are incredibly long-lived semi-eldritch abominations with incredible power beyond everything but the most elite NPC forces. There are also hints of a longer-running plot revolving around the origin of the PCs in the world, the nature of monsters, &c. There's an additional complicating aspect, insofar as that NPCs die when they are killed, which comes up a number of times in various ways.
The politicking quickly moves from interfactional disputes in the city where most of our protagonists find themselves, and by the end of the season it has become fairly involved, as both other PC factions and NPC nobility and notable figures are making their moves to capitalize on the situation.