I have the Can Clip it does all I need it to on my Megane as for diagnosing it will do it as long as you have a PC that includes its software. The main reason I got Clip is it covers all the rovers so the MRS, MGF, I can sort out when the car ever goes wrong and it never let me down.
About Multidiag Pro and Clip, I think the biggest difference is their vehicle coverage. Multidiag Pro is universal (works in a very large car brands), while CAN Clip Renault is for Renault cars. Besides, Multidiag Pro is cheaper than Clip.
The DDT2000 actually does not pass the test. I have got a MAF sensor disconnected and the software is not able to read it. It just states that no errors are present but in fact there is something going on. Then I plugged ELM327 scanner and run its software, there it is the fault present. For now the price is the only good thing, but so is the ELM327 cable and way more easy to use.
Conclusion: Renualt CAN CLIP and Multidiag Pro are clearly above DDT2000 and both can do what DDT does. CAN Clip works good with Renault cars, Multidiag Pro supports other car brands. As a DIY-er, I would choose Renault without doubt. But, this rank may change if you own a car that works fully or almost fully in KWP protocol, cars before 2004 or so.
In the PCB, engineers add the high quality chip CYPRESS AN2135SC or CYPRESS AN2136SC.
The new chip AN2135SC/AN2136SC solved communication issues of old CLIP versions below. That make CLIP work more stable and can be used for a longer time
Using other versions of Renault CLIP, the diagnostic interface will disconnect if users have no operation for 10 minutes around after successful communication to the car.With this new CAN CLIP for Renault, the issue solved, with the chip AN2135SC/AN2136SC. This is the PCB with new design from obd2tool.com.
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