If we're talking about the same thing? I have a new Cadillac XTS with the adjustable seat extension. I am tall also with long legs and this works perfectly for me in the Caddi. However it is a waste to think its of any value in a C-7. My legs are propped up in the cabin of my C-7 and would never touch the extended seat if equipped. I am 6'3" and with the recommended seat adjusted, per the Forum, fit just fine. The most fun car I have ever owned.I should add my observation about the Recaro seats in which I sat in a Cadillac CTS V Series at COTA. They were very similar IMHO but had an added feature of an adjustable seat cushion 'extension'. I have long legs for my height so I thought this is a nice feature if you wanted additional support to ones' quads. I have a rebuilt right patella as a result of a bad bicycle crash (into a stone mailbox at 30+ mph) so my knee used to ache after several hours driving if my lower right leg hung unsupported- kinda like the feeling of sitting on a barstool. I don't know if anyone else has knee problems but I think this seat adjustment feature could help.
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Cyber Grey, Born Oct. 29, 2LT, Nav, Auto, Z51 Spoiler.