I did GVT squats for the first time today. I thought I could manage 50kg but I was so so so wrong. I did 50kg for the first 6, which went: 10,7,8,7,6,4 .. At this point, I knew I had bitten off a bit more than I could chew, so dropped to 40kg, which is probably where I should have started, and finished with 7,6,7,5 .. Cor, it was pretty tough going with 60 seconds rest, was panting like it was an intense cardio work out. Loved it though.
Yeah, you want to get full sets out for the first 3 sets roughly. Then you'll find they start to drop as you progress trhough the sets. I read it's not uncommon for the rep total to drop and then rise then drop again as you go through the sets. Can't remember the reason but it doesn't mean the weight is too light so don't worry about that. I remember sweating buckets, it was awesome.
OT: Got my theory result for my level 2 gym instructors course. 44/50 and I aced the practical assesment. So now I'm qualified Level 3 in march hopefully!