Liam has been around the Lotus/VX220 world for a long time and MMG were previously based in Ashbourne. I'm sure you have checked already and there don't look to be any negative comments around (which, let's face it, would have been all over the internet and social media!)
Best idea is probably to call in, have a chat to them about your plans and see how you feel. Like you, I've used Unit 4 and - for the past few years - PJS, who I've always been happy with, but MMG is one on my 'possible' list!