I used these glasses about 8 years ago, I had 2 pair of them. My first impressions were that it was quite awesome, but after longer usage it starts to get very tiring for your eyes. Also, 60Hz is by itself not very relaxing for your eyes. An additional point is that most people these days don't by CRT screens anymore and that many CRT screens don't support their highest resolutions at their highest frequencies.

So in short: It looks very good, but it's too tiring for your eyes for serious(longer) usage.