well, once you get into season 1, things quiet down, the transfer is cleaner and haven't noticed synch issues. But it's still not a clean transfer by any means. For example, in the opening shot of the 2nd episode where Sharon is sitting and the water is dripping and pooling around her, each time a drop falls into the pool, the water just fractures into a mess of pixelated boxes... it doesn't look anything like rippling water. If you compare it to something like the heroes HD DVD set, you'll be disapointed.
So... mixed bag... if you have the SD set... think twice about upgrading, little improvement but some of the visual effects shots DO look better. Galactica's "ribs" and armor plating are much better defined and protray that flying buttress feel much better, the ships in general look better and the shot of caprica's atmosphere as the nukes are going off is just amazing. the True HD Audio is reallywell done (when synched proper).
If you don't have the SD set, go ahead and get the HD-DVD set