This is pretty much all you need to know in terms of "is it just as good as a normal Mac?"...
MacBook Air
•.76" high
•12.8" wide
•8.94" deep
•3.0 pounds
•1.86GHz or 2.13GHz Intel Core 2 Duo processor with 6MB on-chip shared L2 cache running 1:1 with processor speed
•1066MHz frontside bus
•2GB of 1066MHz DDR3 SDRAM onboard
•120GB 4200-rpm Serial ATA hard disk drive or 128GB solid-state drive
•Optional external USB MacBook Air SuperDrive
•One USB 2.0 port (up to 480 Mbps)
•NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory
•Up to 5 hours wireless productivity
•Starts at $1499
Advantages
•.19" less high
•1.5 fewer pounds (not counting optional super drive)
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MacBook Pro 13"
•.95" high
•12.78" wide
•8.94" deep
•4.5 pounds
•2.4GHz or 2.66GHz Intel Core 2 Duo processor with 3MB on-chip shared L2 cache
•1066MHz frontside bus
•4GB (two 2GB SO-DIMMs) of 1066MHz DDR3 memory; two SO-DIMM slots support up to 8GB
•250GB or 320GB 5400-rpm Serial ATA hard drive; optional 320GB or 500GB 5400-rpm hard drive, or 128GB, 256GB, or 512GB solid-state drive
•8x slot-loading SuperDrive (DVD±R DL/DVD±RW/CD-RW)
•One FireWire 800 port (up to 800 Mbps), two USB 2.0 ports (up to 480 Mbps), SD card slot
•NVIDIA GeForce 320M graphics processor with 256MB of DDR3 SDRAM shared with main memory
•Up to 10 hours wireless productivity
•Starts at $1199
Advantages:
•Faster processor
•More RAM
•Larger storage capacity
•Built-in SuperDrive
•More input ports (1 FW and 2 USB vs. 1 USB)
•Twice the battery life
•Out of the box $300 cheaper
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My maint point here is, you could probably buy a Mac that is the same spec as the Air and get it for nearly half the price. So for me, this just sounds like a no-brainer.