Ian, I like to look at products in this scenario..

Let's say you buy a new fancy half ton pick up truck..loaded with all the bells and whistles..power everything..
If you are a weekend user and need to haul a few items from Home Depot on weekends ..it will do the job, and last a long time without problems..

Now if you are a Contractor[Pro } and use it everyday, maybe even abuse it with overloading and subject to wear and tear...sure you can still have all the bells and whistles...but this Pro would buy a 3/4 ton truck and heavy duty at that...The return will be a better serving vehicle and less problems with the common breakdowns of lighter equipment..

You can fill in the blanks of any manufacturer and the truth still holds merit..
As an example I can't believe the Roland E-50 is going to do the job day in and day out as the G70 will...The G70 is built to use professionally[as in a heavy duty 3/4 ton pick up]..compared to the intended home use of a E-50...