Welcome greg7,
What do you mean by "upgrade"?
To me Timbernation stuff looks nicer and you'd have greater choice of woods, sizes, configurations, and finishes.
Pierre Sprey and his enthusiastic customers are the only sources for performance ratings of his racks I know of. His stuff seems a bit overpriced for what it is and styled best for neo-tech or post dorm room styling.
But what do I know? I use a $30 Ikea Corras night table for a rack.