i used the Estring for a few months when I wasn't on full HRT and it was definitely the best thing I tried . The only problems I had was that it seemed to run out before the end of the 3 months and I did get a bit of thrush now and again - I use a vaginal gel that keeps the acidity level up to stop the thrush taking hold - I tend to use this gel all the time anyway to help keep comfortable down there. There are various vaginal lubricant gels out there but I like using Multi Gyn actigel.
The Estring was certainly the easiest option as you just pop it in and forget about it. DG x