I'd go for it, I've just finished my first 3 months with them. 7 out of 10 jobs are timewasters who don't reply but I get around 5 leads a week.
I've had a re-wire (quoted on 3), an outside light and a shower which then lead to a PIR. Affordable at the moment but if it takes off will it stay that way? I'm getting in while its still cheap and theres few enough tradesmen to still have a chance of getting the job.