The reviews on this store seem to be located in the extremes - either brilliant or don't go there.
I have just purchased a pair of glasses there and found the whole experience polite, efficient and stress-free. Arranging the eye-test was easy, the optometrist was charming, helpful (even suggesting that I could stick with my off the shelf readers), and had a sense of humour.
Buying the glasses (I still needed the ones for longer distances) was equally without pressure. I eventually went for the cheap and cheerful end of the range but there was no let up in the quality of service. A slight downside was that they didn't have examples of all the frames I'd shortlisted from the website but it wasn't a huge problem. I arranged to pick the glasses up in a few days but rang after two to ask whether they'd arrived and whether I could pick them up sooner. The appointment was altered without issue and the person I collected them was very helpful.
So, all in all a good experience and I cannot understand the previous (extremely) negative comments. Perhaps there's been changes, but my experience was that I didn't have a problem and if anyone were to ask me whether it would be worth going there, I'd say 'Yes'.