I actually sold my Hexamid tent a couple of months ago now. To be honest, I sold it because I had purchased another tent, so I decided to part with the Hexamid to help dampen the monetary blow a bit. However, I loved the Hexamid, so it was a tough decision. What made me go ahead and sell it was the floor. I loved everything else about the tent, but in the rain, the mesh floor was a bit of a hassle FOR ME and in the end, I decided I would be happier without the mesh floor.
I never found the mesh floor to be a problem if the ground was dry, and IMO, it didn't attract any more debris than any other shelter floor did considering what can be carried onto any floor from going in and out. However, if it rained, the mesh floor collected a lot of water. And to make it worse, if I was set up on dirt, then the splatter was filled with dirt, which collected in the mesh. This was a hassle (again, FOR ME) to deal with. Due to this, I learned to set up on grassy area's if I was expecting rain, which solved the dirt issue, but I still had to contend with the water issue. And trust me, that mesh can hold a lot of water...
As far as condensation, I can't speak for the SL2, but I never had an issue with condensation in my Hexamid. Sure, if it was 100% humidity outside, foggy or raining, I would get a little bit of moisture on the inside, but never as much as I did with my Silnylon tents. I feel like this was due to the large interior space (I had the Hexamid Solo Plus) as well as the ventilation that the Hexamid allowed. Even with 2 inside the tent, it wasn't an issue FOR ME. Of course though, the SL2 is a bit different shape, and made from different materials, so I can't really speak for that.
And might I suggest that if you do decide to add bug netting around the perimeter, don't attach it right at the edge. I would leave a little bit of an overhang on the outer tarp. This way, when rain rolls off of your tarp it will not travel along the mesh. Depending on how low you pitch the tarp, it may help with keeping some water out of the mesh...
Also, I never got to use my Hexamid in the snow, but as others have mentioned, I would be worried about using a mesh floor in snow since it could become frozen to the ground/snow.
Anyway, I am by no means knocking the Hexamid either. I loved that thing, and am actually in the process of saving $ to re-buy the Hexamid Solo Plus tarp and likely an inner net tent for it. I know that there are others that have used the tent and was fine with the mesh floor. But for me, as much as I loved the tent, the mesh floor wasn't my favorite option.