These decksavers are a good idea. They protect against knocks, dust and spills.
Pros - it fits well. The moulded plastic is sturdy.
Cons - none of the decksavers I've bought are supplied with any way of attaching themselves to the unit, they just sit snugly on top. So it will need to be tied down in some way if you want to transport the drum machine. They're also quite expensive for what they are.