I've had E-Classes and S90s on XCAR bookings before, so it's a mix depending on what's available when you're there. The last S90 I had two weeks ago was a fully-loaded LWB Inscription T6 AWD model. And on a positive note, the XTS is getting replaced with CTS and CT6 models, both of which are better equipped and much nicer to drive.

I've mentioned it in other threads, but for those accustomed to Sixt in Europe, especially in the UK and Germany, be prepared to lower your expectations, IMO. It just seems that Sixt in the US has positioned themselves more for cheap occasional leisure rentals, so their treatment of business or frequent renters leaves much to be desired. I have yet to see any US location have a very efficient Express process like at many European airports. As an example, I showed up to LAX this week to pick up an LCAR and the general pickup line was pretty full. There was a separate Platinum line which I stood in, but was ignored by agents the whole time -- I ended up waiting about 20-30 minutes, and then another 15-20 minutes to go through the whole rental process that should have been covered by Express service. Supposedly Platinum members can also use the Diamond Lounge as well, but it was unstaffed and closed.

LAX is one of the better locations though, as they actually honor the Platinum two-class upgrade benefit most times (agents at other locations have tried to upsell me to what should be a standard Platinum upgrade). I usually push about 60-120 rental days through Sixt and that's only because of the upgrade policy and pricing for LCAR and above (which are usually more reasonable than the major companies). For PCAR and below though, I would never choose over Sixt over National (especially at LAX, their location is probably the best in the National system, IMO).