This edger is the best for working around door and window casings -- no masking required! Just be sure not to load it with too much paint or it will seep past the roller wheels. Once you get the hang of it, you'll be surprised how quickly the chore of edging and cutting in can be completed... and you'll wish you'd had this tool for any previous house painting.
I don't understand why another reviewer marked this product down as being "only" for edging when it is an EDGER. Know what you're buying and use the tool accordingly; you won't be disappointed.
I believe it may be ok as long as you keep in mind that this is for edging not for full painting. It helps save time & less mess around the edges.