Hi there,

yes it is nice book though it depends totally on u .
Only u can decide what's good for u I can only tell u the type of questions it have .
Errorless has a bit tough questions if u like challenges then it's nice .
If u don't want to practice too many questions of single topic then it's nice .
Before picking up any of the books of competitive exam preparations make sure that ur concepts are clear .concept building is a primary thing so focus on that first when that's done u can proceed to any of the competitive exam books according to ur caliber and interest .
Let me know if u have any more queries...

hope it helps!!!