i made my own that is like this one, works awesome. it is very consistent, but a little touchy to adjust. i think 1/4 turn was like 1lb or something to that effect...
built not bought here also...
I have this one, it was the 20 shipped ebay special. Worked great for about a year, then went to shit. Took it apart and it was all coroded inside and rusted. I sanded it all clean and it works again, but now it's fucking up again. When it fucks up, it won't boost over wastegate, so this fixing to get fixed.