I'm sure there are some great people in those guilds like The Purge and Vae Victus. I know I spent a lot time w/The Purge in BRD. Same also for VV. My friend Spirithex and I go way back since Mordred (we were in same guild at the time).
However, I recommend using your own discretion when grouping with the aforementioned guilds. Most of time you get cheated out of quest or loot items you need, spend 90% lost in an instance and wasted 3 hours, or 5-10 man group disbands even before you get into the instance.
I think those who experienced instancing with VV find it absolutely horrible worthless time spent in game. I did LBRS with Mane (who's an officer or GM of VV) and he received loot items that his guildies wanted and treated everyone like they were newbs to overall instancing. I probably will still group with VV on occasions but guild comes first.
We're doing a lot of guild raids with Reso, Redux. We've been doing 3-4 instances a day. Just log on and see what's new

The message buck stops here.