I have done the solo bit & I don't care for it. You have much more artistic lattiude with a duo than solo. On occassion I have done the trio & even tried a five piece group I prefer the duo. One thing I find it is much easier to book a smaller group than a larger cause $400 spreads alot better among 2 people than it does 5. If a duo puts a bit of thought in it,& mixes the instruments they can have a much fuller sound than the sum of their parts