Good deal on a BMW 340i Loaner?

MSRP 59700, Loaner 3942 miles
Premium Pckg
Track Handling Pckg
Shadow Sport Edition
Sport seats
Shadowline Exterior Trim
Hands-Free Bluetooth & USB Audio Connection
Alum Dark Carbon w/Pearl Gloss Chrome Highlight
Harman/kardon Surround Sound System
SiriusXM Satellite Radio

offer is:

$600/mo tax in, $0 drive-off. 36/15k.

When I calculate on Leasehackr calc, I get a deal of
Monthly Payment (Excl. Tax): $562
Monthly Payment (incl. tax): $601
Drive-Off: $0
Registration and doc fee: $480
Tax on cap cost reduction and fees: $6
Refundable MSD Payment: $0
Leasehackr Score: 8.7 years
Disposition Fee: $350
Total Lease Cost: $20,994