Servomotors & Minimill - do these need speed reduction or not?

I want to CNC my minimill. I have Electrocraft E543 servos and Gecko
320's. I have received conflicting advice about whether speed
reduction (& torque increase) is necessary with these servos.

A listmember who is using these servos on his Sherline? mill stated:

"My Mill is much smaller than a grizzly but then again my servos are
way overkill for my applications. I have them limited at 10a (geckos
can put out 20) and I still have WAY more power than I need. Alot of
people seem to be useing those huge surplus amtek (may be spelled
wrong) servos for those size mills but I'm thinking the E543 would
still do a good job on that size machine. Youll defenatly need a
reduction.

These motors have a Kt of 14.9oz/a and a continious current of 3.7a.
This works out to a continious torque of 55 oz-in. This might seem a
little low but the peak torque is 420 Oz-in and combine these specs
with a belt reduction and the torque isnt so bad. If I'm not mistaking
people use 600 oz steppers on these size machines (better confirm
this!). And steppers are rated in terms of holding torque, as in when
stopped. The actual torque is much lower.

If you were to use these motors with say a 4:1 reduction you would
have 220 oz-in continious at the screw with a peak torque of 1680
oz-in. I think this would be more then sufficient. These servos
running from geckos (assume 70v supply) will run at 4000 RPM and still
provide full torque. You could run them at 5000 RPM or possibly even
higher with a slight drop in torque. Should be fine for rapids. Lead
of these machines is 0.0625 right? Assuming 4000 RPM and 4:1 reduction
(lets be conservative) this would give you a rapid speed of 62.5 IPM.
3:1 reduction would give 83 IPM rapids."

Another source who has experience with CNCing the minimills suggested
I could direct couple these servos for the X and Y axes. He drives
these axes with 150 oz-in steppers.

What do listmembers think? I have no experience with servos and need
some sound advice.

Grant