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I have a NT520 and ISTA in my tool box. The 520 doesn't seem to work well with the F chassis, the NT530 might fix that as others have said. I think the Foxwell NT520 does a pretty good job of doing the normal ISTA type service functions and scanning on my E90. ISTA has the manuals, and diagrams which is a pretty big plus, but ISTA has a significant learning curve of getting it setup right. ISTA typically requires a few bux for a Mega subscription to get the large downloads. If you don't want the ISTA hassle the Foxwell NT scanners do a pretty good job IMHO.
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