This is probably one of the best Synergy modules. I use the IR-X on a daily basis, so I had a rough idea of what to expect. Compared to something like the SLO II, this preamp behaves more naturally when it comes to gain. As a result, it's not as compressed, and both channels can be usefully dialed in across the entire gain range. Paired with the SYNERGY 20IR head, it's a brilliant solution.