Very easy-to-use map maker, though it's more for sci-fi and modern maps than fantasy ones (as the title states). Of course, most map makers focus on fantasy, so it's good to have one that does something else (particularly with cyberpunk games becoming more popular thanks to the hype surrounding CP 2077). Besides the ease of use, what I like about Shuffler is that it's very no-frills and doesn't fuss about with too many things — which is a double-edged sword. On one hand, map sizes are limited. You won't be able to create a sci-fi megadungeon with this (not without a few workarounds). The limit for a single map is 10"x7"; you can join maps together (up to 4 segments) using the program, making the limit 20"x14", but that's the extent of it (again, unless you use workarounds like Photoshop to manually join more map segments). On the other hand, this also means the program is really straightforward and focused. It comes with quite a few tiles that you can use (though lacking in furniture, which you can purchase as addons or import using the paid plugin), and it's just a matter of dragging and dropping.
One thing that bugs me is that the hotkeys are tricky to use, and the program does glitch out at times with objects that refuse to be deleted or resized properly. It's thus important to save regularly. The interface is also extremely obtuse, and trial-and-error is not an option here since it lacks tooltips and info bars. You'll really have to go through the guides (in the program and the accompanying PDF) while experimenting with the hotkeys and buttons to properly understand what they do. Once you overcome this hurdle, however, you'll be able to start creating maps in under 10 minutes.
All that being said, I greatly enjoy the convenience that the program brings to the table, and with the lack of sci-fi maps out there (besides those from regular creators like Heroic Maps, Loke's Battlemats and Paths to Adventure), this program is a godsend. For that, it gets 4.5/5.