Just to show that I have no bones to pick with Dell or any hidden agendas, I have 3 Dell PCs and 3 printers in my house.
My Inspiron 9300 is 6 years old and the monitor is just about dead.
My 5 year old Dimension 5100 is my main media streaming server, slow but plugging along.
My V515W printer is a great wireless all-in-one that I highly recommend
My 1230C is a great buy for quality color laser printing.
My Girlfriend's Dimension is older than all of the above and still hodls its own.
I bought a Studio 17 with a T6600 for my mother and its a great buy for the price... IF you want a T6600.
BUT the Studio 15 with the I7-720QM has a proven history of hardware failures, mine being the CPU TWICE!!!!
So, I'm a loyal Dell customer, recommend them to others but highly recommend avoiding the Studio 15 1558 (I7-720QM) until Dell publicly admits to the problem and delivers a solution.
I'm not crying wolf because I got a bad laptop. Actually, I'm into my 2nd Dell Studio 15 1558 and it has failed too.
Here's the common config:
I7-720QM Quad Core
4 to 8gb RAM (1066mhz)
500gb HDD at 7200rpm
ATI Mobility HD 5470 with 1gb
720 to 1080p display
Windows 6 Home Premium 64-bit
Both of mine had CPU failures within the first 24 hours of operation. This was confirmed by Dell Technical Support and by running Dell Diagnostics at the hardware level. Actually, my first Studio 15, just 3 weeks ago, failed at the CPU and motherboard level...
AND, it appears that this isn't an uncommon occurrence. Just read the threads in Dell's support forums. Such as this one: http://en.community.dell.com/support-forums/laptop/f/3518/p/19303691/19586387.aspx#19586387
As of today, I would highly recommend staying away from the Dell laptop lines running the I7-720QM processor. Having felt the brunt of these problems, I would probably recommend avoiding any I7 CPU in a Dell. Looks like they either have a batch of bad CPUs or a compatibility issue with their motherboards.
If anyone from Cnet reads this, I encourage them to investigate these problems. Cnet is a reputable 3rd party reviewer of technical products and I believe has a responsibility to report on known technical issues such as the those discussed above. I welcome them to contact me directly for more empirical evidence. I have 20 years in IT, don't go on hearsay and have done my research. The public has a right to know that these machines are consistently failing.