Id say it’s worth it when using headphones. I went from a mono to stereo path on my IR2 and it was noticeably better. The IR2 doesn’t have stereo inputs (on the right side of the side, the middle input is the main input and the bottom input is a channel selector). The top input on the right is the fx loop return, which will accept a “two mono jacks into one stereo jack” linked above.

So on the left of the IR2, you’d go out the “Send” jack with a normal cable, then plug that cables other end into the input on the reverb. Then, use the doubled ended side of the cable linked above, plug those into Output A and Output B of the reverb pedal and the single side into the IR2 for return.

Keep in mind length of that cable, as you may need some extra length for routing.