We address this with IMMI as we offer far more competitive rates with maintenance including training as part of any system renewal. Maintenance: This is the first thing that consultants tell me they hate about CadnaA, the fees for renewal and maintenance is high.Here is what I have found using 3 simple points: Maintenance, Support and Price But what makes IMMI different and how/why are we now switching people from CadnaA to IMMI? It’s amazing to me how many people use CadnaA in the UK, and of course it’s a good piece of software making it an obvious and good choice for the user. This has allowed us to speak with consultants on another level, rather than just discussing hardware such as sound level meters. AcSoft have been the proud exclusive distributors of IMMI noise software now for a number of years.