Will the Big Ben improve the 24 MXL?

I wouldn't waste my money, & keep Big Ben away from Big Jerry's Dac. I like to play too, & feel like a Audio Pimp in training lately as I took a Sonic Frontiers Jitterbug in trade not too long ago. It actually degraded the sound of the AL 24 mxl somewhat. The biggest improvements have been tube rolling with Siemens, & a pair of Harmonix Gp-101 Xlr's from the dac to pre. I would give Jerry Ozment a call, as he will not steer you wrong, & answer any questions you may have on his product 203-796-0648. If you order a AL 24 mxl the Balanced Xlr output $500.00 option is a major improvement over single ended, & a more valid upgrade than a non necessary jitter reducer in my opinion. Have Fun!

Elberoth
It was late when i posted this morning..i know it's not an upsampler. Is anyone using any type of Isolation device with their dac?

Yes, it sits atop a piece of 3/8" thick green egde acrylic with AQ big feet below. Any piece of tube gear will appreciate some sort of vibration isolation.

IF you're using a transport with low jitter, the Big Ben(BB), IMO is of little value and may disgrade the sound quality. I've listened to both the BB and Genesis Digital Lens and prefer the DL, but the DL can't handle rates above 48K.

I haven't heard the 24 MXL, but from what I've read it appears to already have very effective jitter control circuits built in. How does it react to different quality
transports?

Elberoth & Kana813
You are comparing apples with pears. Big Ben is a stand alone word clock, Digital Lens is a reclocking device. See http://www.apogeedigital.com/products/bigben.php with links to very positive reviews.
As always: try out in your own system. The effects depend highly on the degree of perfectionism you've reached (and appreciate ;-) IMO slaving a transport to a DAC or (in this case) to an external word clock like Big Ben is nearly always an improvement. Degredation is very unlikely (also from a technical point of view), in contrast to inserting reclocking devices.