I have both as well.. the Siren is definitely a MTL tank. Can be tricky if you are not an experienced builder. The Nano is great but that's my DL tank. Much, much easier to build on but like I said I run it around 50w. It is more restricted than most DL tanks out there but that's why I like it. All my other tanks are MTL. It's a great tank but I think your comparing apples to oranges there.