We went a couple of weeks ago with Brent and Mary Ellen Haywood - it is a great day trip or over night trip. (Trip Report)
Three days??? Unless you are going out of the canyon and exploring the rest of Anza Borego or do a lot of hiking or sitting, I'm thinking 3 days is two too many.
The road is doable in 2WD right now as it has been graded - there was a lot of traffic driving in and out all day and many campers along the way - it was a holiday weekend.
There is a by-pass road cut around the water section - they don't want you in there anymore - but you do cross the stream a couple of times.
We would be interested in joining in if timing is good.