ok BM. i dont necessarily agree that the OEM companies are 10-15 years ahead of the non OEM companies. the advent of gearless electronic drives,VVVF drives,gearless ac machines have been around for a long time and generally in my experience the software is really the only difference between companies and this doesnt really show a clear or better performance than any others from MCE to MCS411 to MIPROLOG/STAR(local product).
there is nothing wrong with going down the OEM path but you must be informed of the prorietary nature of the equipment if you do decide to get another service co in. as long as you are informed before you go ahead then its all up to you how you procede. finally remember i always recommend an all inclusive maintenace contract as generally includes all service facet costs(with a few exclusions ie vandalism) and you can consider it as an insurance policy against failure.