Delighted with my AtoZ. Used to have one for many years and decided to update a few years ago. Unfortunately I did not buy the official version but some hybrid, which I hated as many of the roads etc were missed off.
This product is great as far as it goes - the spiral binding allows it to lay flat and the scale is large enough to glance at while driving (which is what I bought it for), however it doesn't quite go all the way out to the M25 ring which may be a pain if you live near the edge of the zone covered as I do. I run out of map to the northwest beyond my homepage and sincerely wish it covered Uxbridge, Northwood, Watford, Bushey and Borehamwood - but it doesn't, and its similarly curtailed all around London; Chingford is in but Loughton is out, Dagenham is in but Romford and Hornchurch are out, Bexley is in but Dartford is out, Chislehurst and Farnborough are half in and Orpington is out, Croydon is mostly in but Purley is out, Carshalton is in, Sutton is cut in half and Ewell is out, Surbiton is in but Esher, Walton on Thames, Weybridge and Chertsey are all out, Ashford is in but Staines is out. You'll know whether these limits are sufficient for your purposes.