IMO if you cant find a decent review on the product then it isn't probably all its cracked up to be.
I checked out a few before buying this one Tuning Box for Skoda Fabia/Octavia/Superb/Roomster 1.4 TSi 180 bhp Twin Charger

Used by a fair few vrs drivers on briskoda
TMC Tuning Box Review - 1.4 TSI Engine - Skoda Fabia II - BRISKODA.net - The Skoda Forum and Community

Just be sure to check wether you have a cave or cthe engine first being my12