I worked for an Agency for about 6 months.
Great money but not sufficient enough for how I wanted to work.
You may get 2/3 days a week, have to be on emergency cover, and to be honest, they do treat you well...But it's not a great way of nursing.
I prefer to work in a practice rather than locuming. For me petrol money, parking, indemnity, GDC, plus travel expenses if the work was over 1 hrs drive, didn't appeal to me after about 12 weeks of locuming.
Give it a go if you fancy, but it's not great.
You'll be disappointed when everyone jumps on the bandwagon and you can't get any shifts, or take short notice so you cancel your own plans.
Good luck xx