I've owned this for a few months and I keep meaning to write a review when I use it. But after I use it, I end up not writing a review. I've used this almost daily since it arrived and, if you want the short version - go ahead and click add to cart and enjoy the upgrade.
Slightly longer version - Seems like most people pick up the Solo 2 and have no problems using it from the start. For some reason, the learning curve was a bit higher for me. How tight to pack, how hard to draw, etc... Spent a lot of time on the forums and read all the advice. This piece was mentioned so I purchased and, it really helped me figure out my errors. The draw can be way less restricted than the stock stem, but with the carb you have a lot more control over that preference. And, this glass really does cool down the vapor. For me, it significantly cooled it. I've used the WPA but sometimes you just want a no fuss session. This is perfect for that occasion. I will note that if you're fairly happy with the stock stem and you prefer a more restricted draw and the warmer vapor doesn't bother you, then this glass might not be the upgrade it was for me. But if either of those two things are affecting your experience, then I'd certainly suggest this piece.
If this broke I'd immediately buy another one. It's functional, allows for more control of the draw preference, and it's a nice looking piece. It feels just as high quality as the stock stem, maybe even a bit more. I know everyone's experience is different, but for me, it really was a game changer. 5 stars for sure.
PS - Customer service was fantastic, by the way. Some nice touches that really stood out.