The best part about omp plus was that they could provide us everything we needed to run our business smoothly; from ERP/MFG software through accounting packages right up until CRMs like salesforce etc! They can do almost anything you want them too so if there's something specific your looking at then just ask their team & see what happens (or not).
Nothing really I don't think but maybe some people will be annoyed when trying figure out how things are meant 2 b setup or configured which i'm sure isn't easy even after asking numerous times over multiple days? Maybe an interface would have been nice between systems especially once more customers were added into mix - eg adding new suppliers via supplier management module rather than having customer say add another vendor manually each time.