Marco... now thats a good question!!! First, MicroMesh grades its abrasives a bit differently than the ANSI or CAMI. What they call 1500 is close to what most of us would consider a 400 grit. Their 3200 is relative to a 1200 grit and so on up their range. In the 1500 range I would say that there is definitely a difference. (I did all of the sanding WET)
The scratch patterns and reflective quality of the surface, such as it is at 1500/400 grit were/was better. I have to say, this is just an opinion and little more. 3200/3600/4000 grits left behind progressively better surfaces but and this is a big BUT, you really had to work at it. Not so much being aggressive or grinding down on the work surface, just slooooowww and steady. Kernneling wasn't much of a concern in these grits which was nice but I still had to wipe the surface down routinely and proceed from there. Anything over the 4000 was more polishing than surface/material removal. The resulting finish was just beautiful, almost mirror quality. In a couple of the pictures you can see the reflection of my kitchen light in the table top. That does not even come close to what it looked like in real time. The light is a Tiffany style lamp and the details in the reflection where just awesome...
One of the things that really gave me fits was that the surface has to be dead flat at those types of reflection ranges. The slightest ripple/wave/imperfection sticks out like a sore thumb if the surface isn't dead nuts flat. Jumping grits or skipping a grit range or two doesn't cut it either. You have to really work at removing the old scratches and pretty much replacing them with newer, finer ones. Basically your swapping one gritty scratch for a new finer one until you get into the polishing grits. (which is how I came to start referring to them, 4000 and up abrasives. Not something that MicroMesh uses)
Hmmmmmmmm so was it worth the time/effort and expense. A assortment for woodworking ran about 44 bucks if I recall correctly. Once you get used to what to look for, how to progress through the grits, the process moves along pretty smoothly, doesn't take forever, yet, does take time!! SO to answer your question, I'd have to say on high end type of projects, Yes, it was worth it.
the other process I used was polishing compounds and they produced even better results than the abrasives. The cost of compounds was reasonable. 50 bucks or so for machine compounds 1 thru 4. The real expensive comes with needing to have an orbital polisher. I'd also say that you will still need to flatten out the surface with up to a 1500/400 grit using a stiff pad or the equivalent.
I finished off the top with a polishing glaze followed up with 2 coats of a best of show carnuba wax...
HTH
bill
Thank you Mike!!! high praise indeed coming from you. 
