Well if you brought a MS keyboard, then moved to a Logitech later on its proberly likely you got a newer model, and things generally improve in newer models.
I've always used MS kb's and mouses.
I have a Comfort Curve keyboard and a Comfort mouse (both wired), and they are brilliant.
Can pick up both for about £13 or so each. Already converted 2 friends to these keyboards, and i didnt even have to ask them, 2 mins of use on the keyboard and they fell in love.
I will say though, after using keyboard, it makes the other MS keyboards i used in the past look like crap.
If you're going to compare at least compare 2 equal products.
In fairness to MS hardware i can also say i've used a few Logitech keyboards and mouses, they were a pile of poo. I've not used the most expensive Logitech stuff though so it was a unfair assessment, possibly as unfair as the other poster's.....