I currently have a YS-01 and a YS-01 Solis driven by an Olympus EM5-II. I mainly shoot manual, with the odd TTL exposure. Recently the Solis (about 3 years old) has started acting flaky (see other thread). I'm looking into getting it repaired, but depending on the repair estimate I may just replace it. I'm a touch reluctant to replace with another YS-01 Solis, so I'm thinking about an Inon S-220. Currently I can share O-rings etc... which is nice. Are there any other known downsides to this mixed pairing? I would imagine the two strobes would be reasonably balanced? I also considered the AOI Q1, but I read that it is fairly weak.