In can second Kef's statements, the current Lancer build has already proven being a very reliable one. Using it I've encoded many thousands of songs without noticing any glitches so far.
QUOTE(metranil)
2. On a similar note, does anyone think it's useful to encode at q7 instead of q6? I'm using my iAUdio as a de facto backup drive, and while I realize ogg isn't lossless, if using q7 means better quality with slighly higher space usage, I'm okay with it...
In my opinion both settings are overkill, hence there's nothing serious to say about this from my side. In theory quality is always better with increasing bitrates, but a lossy codec's intention is to provide transparent quality at small file sizes. An encoded track can't sound better than transparent, for this reason I'd recommend you to actually perform some ABXing instead of relying on theoretical improvements.
If it's mainly about backing up your collection, as stated above, then lossy isn't a good way to go, no matter which bitrates you choose. That's simply due to these caponized files being unsuitable for further processing, making them a poor archive. I'd rather suggest thinking about investing some money for a large external drive which would serve as a data storage for losslessly compressed material. That's the way I did it myself, my external thingamabob is currently filled with a FLAC archive, lots of self-made DivX-/XviD-movies as well as important system and document backups. The FLACs don't serve for actual listening, they're only there for me to be able to create lossy collections for all devices used for audio playback, no matter which file format is actually compatible to the hardware.