Isn't the 153 just an I/O module? Or were you asking about the 351?
http://midas.starin.biz/pricing.php has MSRPs for those.
I might be wrong. I was under the impression that it is an AES50 remote stage box, a higher quality alternative to the S16. And, that I could use it with an X32. Does this sound right?
From the DL153 marketing sheet:
16 award-winning MIDAS analogue mic preamps with switchable +48 V phantom power
8 active-balanced low-impedance line level outputs
Selectable 96 kHz or 48 kHz sample rate operation
Dual AES50 Neutrik etherCON* network ports with LED status indicators
All settings programmable from front panel controls or console
Remote operation up to 100 m via CAT5 cable
PSU status indicator LEDs and configuration LCD display on front panel
Rugged 2U rackmount chassis for durability in portable applications
Auto-ranging universal switch-mode power supply
3-Year Warranty Program**
Designed and engineered in England