I love this disc, and I hate it at the same time. I currently bag 4 Sampos, all varying in their level of stability, as listed below.
175 Orange VIP Sampo - 9, 5.5, -2, 1.5 (this disc has the lowest parting line of any of the Sampos in which I currently have, and it is fairly beat in as well)
173 Blue Elasto Sampo - 9, 5, -1, 2
173 Black Sparkle Elasto Sampo - 9, 5, 0, 2 (the HSS is a zero to me, but when thrown into a fairly strong head wind it starts to show some turn)
174 Teal Sprarkle Elasto Sampo - 9, 4.5 , 0, 2.5 (the HSS is a solid zero for this disc. I can throw it into a very strong head wind, and it maybe starts to look like it wants to begin to turn, but it does not)
Although there is a good amount of variance in the flight paths of the same disc, as is usual for Westside discs the flight path is extremely smooth for each permutation of this mold that I bag (none of them start to turn right away after it leaves your hand, nor do any of them have a very hard, knifey fade at the end of the flight), which I feel really helps to extend how long the disc is in the air, which results in more overall distance.
I obviously love the consistency I can get through carry one mold that I use as a primary driver, but it scares me with how much variance in the flight ratings each of these discs shows; and I have a feeling it is going to be quite hard to replace any of these discs. I have another fresh VIP Sampo, and after it beats in a little more I could see it flying exactly like the VIP Sampo I currently bag. For the more stable Elasto Sampos, the only thing in which I have noticed that the Sparkle Elasto plastic is a good amount more OS than it's non-sparkle brethren. I hope I am on to something with this, in case I do need to replace some of the Elasto Sampos that I currently bag. I also hope that Westside continues to produce the Sampo in Elasto plastic as well, as opposed to discontinuing producing in this plastic after the supply from the Trilogy Challenge has been used up. Either way, I'm being careful with the ones that I currently bag just in case!