I trained Giant sets for a few months now, and have made good results.
I was into the deep discussion we had with Milos a few months ago and all that "pussy weights"-accusations and shit.
At that time, i was doing DC for about a year and had a lot of problems with it.
1. My 'blasts' where getting shorter and shorter and my cruises got longer. I had problems with the high load and was hitting a brick wall. When i put up too much weight, my joints and tendons made problems after 3-4 weeks, so i cruised again with lower weight.
Once back to the blast, the problem kept on reoccuring.
2. I got a bit bored with DC as i wasn't able to progress any further without aching joints and ended up cruising until the pain was gone, then after 4 weeks it was back.
So much for that.
So, when i came to giant sets, it was a relief at first. Volume was high, load was significantly lower but i felt great.
Now after a while i came to love the freedom you have with giant sets. You can work any muscle you want (DC wants you to do certain areas together) and you can do every exercise you like.
Then i started playing around with other training principles. Giant sets superslow? Hell yeah. Giant sets TUT? Oh Yes. Giant sets REST PAUSED?? WTF, i loved it. Giant sets pyramids? sometimes up, sometimes down.
You can do virtually everything with giant sets, sometimes i do a week or two of real high load with slightly lower reps for 2 cycles then 1-2 "normal" giant sets after that.
all in all, i have to say i love the exhaustion and the burn that comes with it, i love the pump but the best is the overall freedom and the frequent changes. It's a new training style for me every week.