We are now at the one and only part I could objectively dislike on this mouse—the buttons. I would like to say in advance that everyone is different, and you may have other preferences. But generally, like those on the Rival 600, a good mouse button can be described as tactile, spammable, without unnecessary travel, and not too stiff or light.
Both main buttons have a fair bit of travel before and after actuation. They are also kinda stiff and have a lot of tension, but are rather tactile as there is no mushy feeling whatsoever. They aren't very easy to spam, especially compared to a spring-retention Logitech main button on the G303 or PRO, for example. For my personal preferences, these buttons don't feel good, but once again, we're all different. I know many gamers like mouse buttons with a good amount of tension as it has them avoid any kind of accidental clicks. For them, this may be an absolutely perfect choice. Interestingly, Dream Machines chose to use Huano switches instead of Omrons in this mouse. These Huanos have a nominal lifespan of 20 million clicks.
Moving on to the scroll wheel, it feels almost entirely the same as the one in the DM1 Pro S, so pretty much nothing changed there. The notches aren't well defined, and it is easy to scroll through them, so it may be ideal for browsing and heavy in-game scrolling. The encoder is a black core TTC with a height of 9 mm and a nominal lifespan of 20 million scrolls.
The middle click requires about the same amount of force to actuate as the main buttons, and the switch used here is a similar Huano switch, but this one has a black shell and white plunger.
The side buttons are pretty good; they don't have a lot of travel and feel tactile. Their switches are elevated tactile switches with a MWK branding and a "14" below that, which I think indicates their height (14 mm).
The CPI switch, which is behind the scroll wheel, is again pretty good; it is fairly light, but doesn't have any unnecessary travel. It isn't wiggly and sits pretty firm in its socket, and also isn't in the way at all because of its flat design—no need to worry about any accidental clicks here. A standard small square tactile switch operates the clicks here.
Cable
One of the main advertising points of this mouse is the cable, and it's easy to see why. The DM1 FPS has the best factory stock cable I have ever tried period. They call it a shoelace because it really resembles the flexibility and feel of an actual shoelace. This cable is so flexible I have no words for it, and it doesn't really generate any drag on the mousepad either. This a solid 10/10 feature I would love to see on all future mice because it really does make a difference.
Mouse Feet
The mouse feet have a very thin protective film on them, so make sure to remove this protective layer before using the mouse! The stock feet are generally pretty good on Dream Machines mice, and the DM1 FPS is no exception. The glide is nice and smooth, provided by three relatively large feet at the bottom of the shell. The friction of these feet isn't very high either, but there are aftermarket pure PTFE feet if you want something even faster.
Disassembling
The mouse can be disassembled after removing four screws in total, which are located beneath the mouse feet. The upper shell has no electronics at all; there is only a PCB, and it has been secured to the bottom plate.