The test type was something new they tried, limited supply. Essentially with the new Good Material also came a welcome increase in dimensions: toy, canal length and weight became a little bigger.
The test type is the older ABS material with these new dimensions, and probably some tweaking to the firmness according to user feedback (I don't have the original ABS though).
Impressions: the AGM one is very soft. I had a Meiki Eiro Chika months before, it is softer than that one. I wasn't fond of the Chika, though, since the sensations were rather dull.
In comes the AGM: this material is amazing, hands down. Not much of an odor, definitely doesn't smell bad, soft to the touch - dries VERY quickly.
Sensation-wise it's really good. Due to the thick walls, it provides an intimate, enveloping feeling, but more stimulating than the Meiki I had, while still amazingly comfortable. Might be comparable to Girl in the Box.
One gripe with the AGM: due to it's softness and limited length, it is a little hard to get a proper grip on it. Hands-free it would be heaven, but as a stroker it can get more challenging. A Meiki which is a little longer and a little firmer is easier in this regard.
I also think the opening to the toy will tear sooner or later. When spreading it you can basically feel it resist. Chances are it holds up, though. For the rest I can see it last a long while.
The ABS is a similar experience, but the firmness leans more to ~ToysHeart, or HotPowers medium firmness feel. It gives an increase in durability along with strengthened stimuli.
With a firmness according to your tastes, very enticing modelling, great materials & durability, this is a great buy.