Looking around and reading this post then I think it just depends what you want to use the Diagnostic testers for, be it for servicing your own car and fault finding & troubleshooting.
There are quite a lot out there and TBH I cannot see the DIY'er spending a fortune on some of the more professional tools (unless you have very deep pockets..), so where does this leave us ? - Like I said so many out there but what do you choose, a dedicated tester like the Durametric or a multi-vendor one like the Foxwell NT644.
Two avenues, if you are ok with spanners, don't mind getting stuck in, intend to service, fault find & repair your car then all for getting a diagnostic tool.
This then leads to the servicing booklet, does it really matter if you have all the stamps in and will it affect the resalable value if you can prove that you have maintained your car, if you're not bothered then I don't see why you shouldn't purchase one. Then again you can still do in the in-between services, fix any issues and still get the major servicing done at your local Porsche/Indie and still have your servicing book stamped.
Anyway, have been looking at the Durametric both the Enthusiast & Professional versions, they are expensive for what they are and have read various mixed thoughts on 'Are they really worth it ?.." – I think they are TBH, but that's my own opinion.
Both the Enthusiast & Professional do the exactly the same as far as diagnosis goes but the Professional is not tied down to vehicles it can service/maintain and also has the coding function. So what is this coding function, from what I have read then it allows you to install/setup an modify certain features.
I still haven't found out what all the features are and if they are indeed a benefit, also do they have all the features of the PIWIS ?. From I have found out, coding can do for example:
1.. Disable the rear spoiler if you wish to fit a fixed rear wing
2.. Enable the windows to open /close via the Key fob
3.. Adjust the ride height
4.. Help bleed the Primary & Secondary brake system
3.. There are probably more out there but have emailed Durametric if they have a 'Layman's" guide in plain English to what extent
Found these links below:
http://www.planet-9.com/reviews/electronics/p383-durametric-tutorial-part-1-3a-the-basics.html
http://www.planet-9.com/reviews/ele...ic-tutorial-part-2-3a-advanced-functions.html