Is Kess v2 clone reliable OBD read/write Edc16U31 Audi B7?

Car model and year: 
Audi B7 1.9 PD TDI 116 Hp EDC16U31 (2005)
Tested Edc16C34 PSa via OBD without any problem.

Purpose: OBD read and Write ECU data

Using: Kess v2 clone

Question: Is it reliable?
Suggestion: Did BDM Backup, test via K-Line / OBD.
So you can back up if the problem is there.

Review 1. EDC16 should be no problem for kess.

Review 2.  No problem with Kess v2 EU -> read/write
Yesterday tried with one of my friend's B6 and read write through OBD no problem.
I use an external battery as a backup for the car's voltage it holds 12,35 - 12,4 volts stable.
After writing waiting about 3 minutes until the start.
Strange this ECU could be set how much success read/write you enable.
First BDM after OBD easy job I think but needs to be careful always

Review 3. today I use Kess V2 read one of my old U31 (it is T5 2.5tdi but unimportant) Kess and Ktag work.

Thanks.

http://blog.obd2shop.co.uk/is-kess-v2-clone-reliable-obd-read-write-edc16u31-audi-b7/