I set it up in about 15-20 mins with weight 5 in the core and weight 1 on the pieces. I then watched JPerm's video on this cube to explain the spring compression and tension differences. The next day I got a 8.4 which was my new PB by 0.4 seconds. Great Cube!

This cube fixes all problems with the 2m. The cube feels amazing and Is a worth upgrade from the 2m.

After nearly 2 months of occasional use of the GTS3 M, I find I still prefer the GTS2 M. The magnets seem to be too strong for me and break up my rhythm. I like the tensioning system.

The tensioning doesnt really matter, because you can change it in 5 minutes max, but it was really dry. Overall, its magnets were not as strong as i expected, but its corner cutting and turning were great.

SHIPMENT:
The time it took from my order to the delivery to germany took 19 days (incl. custom).
The support answers your questions in a decent time frame ( mostly 2-3 days ).
Sadly the USPS Shipment information tracker seemed to be a bit glitched...

CUBE:
Cube wasnt damaged. Nothing was missing.
Right out of the box the cube felt kind of dry which isnt really a bad thing
because you are able to lube the cube how you want it to be.
The tension was okay, but the screws were not tight enough (for my turning style).
It was also pretty fast:
U2‘s were easy possible with just turning it once with a little force (still possible after tighter tension.
However overshooting doesnt really happen in my solves).
Honestly I didnt notice the ridges when I did some first turns. While solving it now it doesnt bother me either.
In my opinion the magnets are the perfekt strenght to hold the cube together.

I got the Gts3m about a week ago and I have done about a 1000 solves on it. The gts2m was my main for every event and my all time favorite cube so I was really excited for the 3. However when I got it it was very dry and badly tensioned so I took some time to set it up with weight five and some angstrom lubes. The cube became better but I still can’t find the right elasticity/tensioning combo that really works. Also I don’t like the ridges all that much and not the magnets very strong feel. I still am going to try to use this cube and explore to see if I can make it good but for now it is not my main.