Not much else I can add to these reviews other than to say: everyone should have a Berg in their bag! It's SUCH a unique disc that does stuff no other disc can do.
I currently have a K2 and a K3 hard. Both fly basically identical, I just switch them in or out of the bag depending on the course I'm playing. If I'm playing a normal course with no weird baskets that have a slope near them, then I play the K3 hard. But if I'm playing a course with some weird approach shots or where the basket is near a slope, then the softer more flexible K2 goes in, as it has a tendency to stick it's landing like it's hitting velcro.
The feel of these two are the same and also totally different. It's the tops that make the difference. The rim shape and feel is the same on both. The K2 has an odd raised dome center, that then puddle down right before the rim. It's an odd shape and look to be sure, but once you get over the look and just worry about throwing it well, the feel becomes something you love about it! Whereas the K3 hard is more or less dead flat, maybe just a touch of puddle top. I also love how it's not too deep, and not too shallow. It's just a touch deeper than a Tactic or Zone, but not so deep that it's like a classic deep dish putter that will get stuck on your hand. It's perfect. And it feels equally amazing for BH or FH. In fact, I throw it FH on almost all approaches from 100' and in.
The K2 is a slick glossy plastic that is very durable, but somewhat flexible, but not so much that it's floppy like a super soft wizard or something. And even though it's glossy and slick, it still somehow has a great grip. Not that you need amazing grip on a putt/approach disc that only goes 150-200'. You're worried more about clean releases and that's why this plastic is so great for this disc. It just comes out of your hand so clean and it's very hard to grip lock this accidentally on a longer approach.
The K3 hard on the other hand is a base plastic, and is very stiff. It dings and scratches much easier, but still feels really good. It's not quite as cheap feeling as DX or D line plastic, but it's along those lines. Kind of like Exo Hard from Discmania, but better. It's stiff and does not flex, so you can feel a little better about putting a hard rip on it without it deforming while throwing. Not that you should be "ripping" on a Berg, haha.
Both have the exact same super predictable flight path. Straight where you throw it, with little glide, then a baby soft turn at the end and just falls out of the air. It's like the difference between throwing and Aerobie (super high glide) vs throwing a Brick (no glide). The Berg just dies where you throw it too. It doesn't glide there. When you first get one, you'll constantly be throwing it short, because you're so used to using a glidey putter to approach, and expecting it to glide past. So you account for the glide and then come up short, haha. But once you get used to how it flies and it's lack of glide, it's absolutely game changing! It's just like shooting a basket with a basketball. You throw it how far you want it to go, and then it just falls out of the sky and stops on the ground. My scores went down 3-5 strokes on avg per 18 instantly just by using this disc.
And to say this disc is a Utility disc is an understatement. You can throw so many different types of shots from 200' and in with this and they all turn out so well, it's ridiculous. There's a reason there's the saying: ALWAYS BE BERG'N. BH approach, yep. BH recovery shot, yep. FH approach, yep. FH recovery, yep. Touchy putts where you don't want to go long, yep. Putting into a headwind, yep. I could go on and on, but you get the point.
Once I found this disc, I went through 4 of them and narrowed it down to the 2 I have kept. I'll NEVER not have a Berg in my bag. It's that good of a disc and will completely change your approach game.
Another thing I've done more with this disc than any other disc by far is accidental throw in's! I'll just be trying to get it NEAR the basket on a short 50-100' shot from the woods or an approach and BAM! It just decides to go in instead! It's insane how many times I've done that with this disc, and every time it surprises me. It's because of it's extremely straight flight path and extremely low glide. It just sails along to the distance you wanted it to go, then falls out of the air. It's extremely rare to be way long with this disc. Which allows you to be much more aggressive on your shot or putt, knowing that if you miss, you're not going by the basket by very much.
Everyone should have at least one of these in their bag. Best Approach disc out there, best all around utility disc out there, and also a great putting disc. Sometimes when I'm putting long, I start using the Berg instead and everything just magically goes in! Such a great disc.