I personally had success with the program and actually had a lot of fun with it. DeFranco really gives a lot of variety in exercise selection in the article and there are countless possibilities for max-effort exercises. I used this program for eight weeks while changing my max effort exercise every two weeks and changing my assistance exercises after four weeks. I have found that I can only last about 4-5 weeks using the same exercises and set/rep parameters, but I think mixing it up with the assistance exercises after four weeks would benefit anybody. It helps to mix it up a little bit and keep motivation high. Obviously, changing max effort exercises every two weeks is a must to keep the CNS fresh; the only reason I would change it every week is if I were performing a one-rep max (but this program keeps it in the three to five range). Another suggestion is to use a variety of set and rep schemes for the assistance exercises; not only does it offer variety but I saw some legitimate hypertrophy gains in employing this method.
With regards to your question about a second lower-body day, I prefer using the repetition protocal rather than sled-dragging. Unless you are competing in a sport that requires a lot of use of your legs, you don’t run the risk of overtraining with a repetition day.
Overall, the strength and hypertrophy gains I made were pretty solid. Even though my max strength in the upper body lagged a little compared to my lower body, the submaximal strength gains went through the rough! For example, on week five I switched my repetition lift from dumbell bench press to incline dumbell bench press while using the same weight. Now one would think that I wouldn’t be able to come close to the amount of reps I completed on week one without using less weight, but I actually amazed myself by doing two more reps than my week one number. It seemed like I was making ridiculous gains every week. However, I will caution that your diet needs to be in order to see measurable results (this pertains to any program); I was using Berardi’s massive eating protocal and really taking advantage of the two-hour window after training. If your diet is lacking, forget about making any progress.
In closing, I definitely suggest giving this program a go. If you want, PM me and I’ll give you the template I created and used.