I am finishing up the Powerscore full-length course and taking the June test.
I don't know what the week end course is like but I can tell you the full-length course is awesome. You get 80 hours of classroom instruction and the four practice tests add another 16 hours. Other prep classes mislead people on this because they count the 16 hours of practice testing as part of their total instruction hours.
You get 5 or 6 workbooks for the course, plus a take home supplement that has about 12 actual LSATs. A separate book holds the four practice tests.
The course breaks down each concept into its simplest elements and then intensely drills each element. So by the time you get to the end of all the elements in a particular concept, putting it all together is as simple as playing with building blocks. There is a tremendous amount of homework for each lesson, but it's understood that many people wont be able to complete it all. The have suggestions as to how to do as much of each lesson's homework as possible. Naturally, the more you do, the better the results, but good results are still possible even if you don't do all the homework.
I started out with a 141 and my last practice test was a 164. Classes average about 8 to 12 people. They have a Homework Hotline that operates Mon to Fri from 3 to 8 pm. If you need help on particular questions, an instructor will walk you through it. It's like having a private tutor available without the expense.
Don't forget that Powerscore's Logical Reasoning Bible comes out in August. If it is anything like the Logic Games Bible, it will be awesome.
NO I DON'T WORK FOR POWERSCORE, I'm just a very, very, very satisfied customer.