Lee works very well, it's very dependent on your setup. What lens, what back, camera etc.
For example, Lee currently makes a Wide angle hood and standard hood. Many sites show a 3rd hood, but I have been told by LEE it's no longer made, however it might be in stock in Europe still. The Standard hood will work on many wides, unless you are planning to shift. I would feel that you can get it to work on about a 35mm or less.
Lee makes an all glass CL-PL that they claim has some IR reduction in the coating. It's in the 100 x 100, (4 x 4) size and I believe in the newer smaller filters for the micro 4/3's cameras.
My setup: When working around water where I need longer exposures of 1 to 10 seconds.
Lee wide angle hood, with one filter slot. If I need polarization I add the 105mm circular polarizer to the front of the hood (Lee makes an adapter ring for this). The 105mm allows for about 10mm of shift with a 35mm SK before I hit the edge of the filter and 15mm with a 40mm on . With the 1 slot I use a ND solid 0.6 or 0.9.
If I am just trying to adjust for a sky and or sunlight brightness on leaves (CL-PL can make a huge difference) I will still use the Lee wide angle hood and the 4 x 4 CL-PL in the one filter slot.
I feel the wide angle hood is much more versatile as it's a must have for wides and shifting and will still work on my 60mm and 105mm. Lee makes the hood with no slots, 1 slot and 2 slots. I would get the hood with slots as you can always take off the slots and just have the hood, but you can't add the slot to a hood that is sold slot-less.
After using screw in ND and CL-PL for years, I find that the Lee system is much more convenient and gets the job done with a lot less to carry. Only big consideration is which adapter ring to use, wide angle or standard to mount the hood to your lens. I use all wide angle adapter rings.
Paul Caldwell