Thank you for the compliment Innrkid, I will continue to try to live up to it.
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ransonjd,
You can have either the flail hammers or the side slicer knives. 
I would just invest in the side side slicers for now if you are ready to buy and 
get used to the flail mower over the summer and fall and then decide it you want 
flail hammers for it. 
Also keep in mind that with the flail hammers you will have less cutting edge in total 
inches per foot of width of cut. The side slicer pairs will have more total cutting edge 
length in inches per foot of mower width and you can flip the knives to expose a new 
cutting edge.
Using a wet well grinder for maintaining the cutting edge will save you time and money 
and will not overheat the knife edge and ruin it.
The MicroMark folks have a wet well grinder for $99.00 and its perfect for flail mower knives and 
hammer flail cutting edges.  
JUST keep in mind the hammers will not shred the brush/material a second time 
and the side slicers will shred the material up a second time as long as the 
mower is set up with the mowing height set at 2 inches or lower.
When mowing in good sod you will be able to mow it once but not recut it a 
second time.
ideally if you have brush clumps its best to back over them and then drive 
forward to shred them up even finer as the rear roller will help you a lot in that situation.
islandtractor has plenty of before and after images showing how well the B flail rotor on his B59 Caroni flail chews up the big brush clumps with immature weed trees he is clearing off the farm that he owns.