I was searching for a shallow feeling throwing putter.

What I got was that and much more. I bought the soft flex, eternal plastic, and nocturnal and the soft flex is by far my favorite. Stand still upshots while throwing backhand feels great, you can put power behind the throw and it'll flatten out in it's flight and then Hyzer out reliably. If you throw it on anhyzer it'll carry that angle for a little bit and then get flat for you.

On a windy day I could consider putting with this because of it's overstability and fade at the end of it's flight. For shorter tee shots this is also great because if it hits the ground the soft flex plastic slows it down and helps it stop closer instead of skipping or sliding away.

I love this disc. One of the only driving putters that feels good in my hand.
 

It is A true driving putter. I am a huge fan of the flex eternal plastic (which is the same as the proton soft plastic from MVP). Not overly gummy in the hot sun, and still relatively flexible on colder days. Definitely does not skip as much as normal eternal plastic does, which has it's pros and cons. 
I think this disc is a bit faster than a 3 speed, maybe a 3.5 or 4 speed. The amount of glide it has is wild, I did not expect that from an overstable putter. I would give it a 4 or even a 5 for glide. When thrown hard and flat (backhand), it flies laser straight for 70-80% of the flight, then has a reliable but not aggressive fade at the end. It has been my go-to for backhand approach shots. 
I do find that it has much less torque resistance on a forehand. It tends to flip up and turn for me on forehands, so I have to be pretty touchy with it if I end up wanting that shot. 
I have not tried it seriously for putting. 

Overall, a great driving putter. When thrown hard and flat backhand, it goes straight with a reliable fade. Forehand shots can be finicky. I use this for mostly open drives of 260-270' or less and backhand approach shots that I want to stick. 

The Lasso is the first disc from Mint I have tried, the soft flex eternal plastic feels great.  It has excellent grip and a good amount of flexibility but is not overly floppy, I assume it's very similar to proton soft from MVP which is a great plastic blend.  The Lasso is a great disc and I use it just like it says on the disc, as a "driving putter".  I like throwing my putters off the tee and use them often on holes 280ft or less.  The Lasso has a buttery-smooth flight, with great glide and a gentle fade at the end of its flight.  It seems like a very versatile disc, in general it's pretty straight but the healthy amount of fade it has lets me throw it on small anhyzer flex lines, and it tends to fight back to the center of the fairway.  I haven't been throwing it forehand much, I do have to be careful not to torque it over too much when I do throw it forehand, it does not have Zone levels of stability.  What surprised me the most about the Lasso is that it has great glide,  It really floats in the air and I was throwing it past most of my other putters when doing some field work.  It seems to fly more like a speed 4 disc than a speed 3, though I don't think Mint gave it official flight numbers.