Don't let anyone tell you that you have to have a computerized system in order to do the very best repairs possible. Don't let them tell you that it makes for faster repairs, either. As I have said, I have the VP-5000 and the 20/20. I like both of them, and there are definate advantages to each. But I have also said this: If I were doing it again, I doubt I would have bought the VP-5000 (which is the non-computerized version of the eliminator). I would have put some of the money into one or two additional 20/20 systems, and the rest into jump starting the business with more aggressive marketing.
I cannot say anything bad about Glass Technology. They have always been square with me, and their equipment is very good. But I am not acquainted with their current sales staff, and perhaps there is someone who thinks he needs to push the high-dollar units to make the real bucks? The practical, common sense thing is, as it has been already said by me and by others: Computerized systems have their limitations. Sure they cycle automatically from vacuum to pressure however many times you tell it to ( does anyone really need that feature?) But the computer does not know when the repair is complete.
In addition to the expense, though, you have this chunky, heavy piece of equipment to haul around and lift up and down for every repair you do. The same is true with the VP-5000. By the end of a busy day, you have lifted that thing in and out of your vehicle, and up and down from other vehicles, more than a dozen times. On the up side... with a workout like that, you wont need weight training at the gym.
The simple manual systems are lightweight and take up less room in your vehicle. If there is a significant difference in the finished repairs, I would love for someone to show me, because in the 6 or so years that I have been using both the 20/20 and the VP-5000, I have not been able to see any difference.
My advice: Put your money into the manual system. Learn to do the best repairs you can possibly do. Then, if you want to upgrade later, you can.
But frankly, I would be very surprised if you really want to upgrade.