Hey Junior Member,
Senior Member is a strange name for a junior member. Weak points on the SD1? Study the instrument and find out for yourself. Ask about reliability, service, and support. Ask about Solton's reliability on other product lines (like the X1). Do your homework . . . go play some arrangers, then make the decision by yourself . . . nobody can decide for you.
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Some see, some don't, some will, some won't