I am a GP. We have used the system for 3+ years and it is much better for REGULAR prescriptions than paper. We get many less queries about missing ones than we used to.
If anything goes wrong it is a nightmare to sort out because the structure of the program is so rigid.
The Dept of Stealth and Total Obscurity believes that everyone collects their prescriptions every 28 days. No-one ever looses tablets or has them taken by the hospital or has any need to vary their timings because of holidays. They insist that we and pharmacies print paper copies of SOME prescriptions. Basically it is a partial and transitional system
Given all that I electronically signed 166 prescriptions this morning. I could not have handled them on paper.
Some chemists handle it badly. So do some GP practices. Overall it is hugely helpful. But it remains a pig to use!