请大家帮看看这个配置划算吗？

BONUS 4GB MEMORY - LENOVO THINKPAD L420 (78544KM) - *$799 Before $300 Cash Card Redemption
Manufacturer :
Lenovo

$499.00*
INC GST
Lenovo
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Features:

    Processor : Intel Core i5-2520M 2.50GHz (up to 3.20GHz with Turbo Boost Technology)
    Memory: 4GB 1333MHz DDR3 + BONUS 4GB MEMORY (TOTAL 8GB)
    Chipset: Mobile Intel HM65 Express Chipset
    Hard Drive : 320GB / 7200rpm Hard Drive
    Optical Drive: Multi Burner/DVD CD Multi Recording
    Display: 14.0" HD Anti-glare LED Display, 16:9 Aspect Ratio
    Graphics: Intel HD Graphics 3000 processor graphics with dynamic frequency
    Audio: Integrated
    Camera: Integrated HD 720p Camera
    Communication: Bluetooth, Advanced-N 6205, WWAN Ready
    Ports:
        4 x USB 2.0 (1 Powered USB)
        1 x Always-On USB 2.0 with yellow marking
        1x eSATA
        1 x Display port with Audio
    Slots: Express Card
    Card Reader: 4-in-1 reader
    Battery: 6 Cell
    OS: Microsoft Windows 7 Professional
    Weight: 2.3kg with 6-cell batttery
    Dimensions: 344mm x 233mm x 32.0mm-36.0mm
    Warranty: 1 Year Depot Warranty
    Extra: Active Protection System, Advanced Spill Resistent Keyboard

最近想买个本子，这个从某个打折网上看到的，相当于RMB3350.这个划算吗？

这个原价是相当于rmb 5360，然后上面说是买了以后，然后把其中300刀补贴回来。具体操作似乎还挺复杂。那个优惠码我找了下找不到，是不是只能等他们做活动才有的？