Mike, I got my varifocals on a 'buy one get one free' deal a couple of years back.
For my regular set, I shelled out quite a bit extra for Nikon lenses. On my 'free' pair, I chose 'standard' quality tinted optics (for use as sunglasses).
Putting aside the tinting, the difference in quality between the two pairs is incredible. The Nikon lenses are much thinner for a start, but their 'sweet spot' is much larger - both these factors make them much more comfortable to wear. I find myself (subconsciously) having to turn my head a lot more to focus with the cheaper lenses.
I'm due an eye test this month, and if my prescription is changed, I'm definitely going to go with the better quality lenses again, these were worth every penny.