Its not cheap, but depending on your needs it might be worth the money.
If you’re not looking to drive as far for fancy fitting technology, Revolution Cycles in Clarendon has the same Retul system and CycleLife in Georgetown has a fancy 3d/laser system too.
I think Laurie’s scheduling pro fits at Proteus again starting after August 23rd, when she finishes her certification. Until then, maybe you could get a semi-pro fit!
For what it’s worth (not much), my issues with minor knee tendonitis cleared up fairly quickly when I added leg extension on my commuter bike.