Yeah we use the Kenton Thru-5.
Looked at the quadrathru, and I do like that it’s MIDI powered.
Just got the Kenton cause that was what was in-stock at the shop.
Works great.
We actually use it in conjunction with a iconnectMIDI2+ so I can get the iPad in on the funz too.

OT MIDI out>iconnectMIDI2+ in
iconnectMIDI2+ out > OT MIDI in
iPad>iConnectMIDI2+(Lemur controlling OT)

iconnectmidi MIDI out(2) > Kenton Thru 5(clock/MIDI from OT)

Kenton Thru:1 Korg Microkorg
2 Roland TR-8
3 Roland TB-3
4 Alesis Micron
5 Korg KP3+

No noticeable lag or delay, but we ain’t sending much other than clock. I highly recommend the Kenton, and the iconnect if you ever need to integrate an iOS device.