The new Samsung 840 EVO mSATA SSD has arrived with 1TB of storage at a price comparable to the existing 2.5" form.  This different way to connect an SSD will not be with us long as M.2 starts to be adopted but currently offers the same benefits as the full sized connection you are more familiar with.  From the tests conducted at SSD Review you can see that this would be a great update to a laptop which possesses an mSATA slot and will greatly improve performance.  While endurance is possibly a concern the fact that Samsung offers a 3 year warranty should assuage your worries somewhat.

"There is no doubt in anyones mind that 2014 will be the year of the M.2/NGFF SSD, however, Samsung is about to release an SSD that is guaranteed to rock the SSD community like few others have. This SSD is the Samsung 840 EVO 1TB mSATA SSD and it, not only is the one and only mSATA SSD capable of 1TB storage available in the world, but also, Samsung has priced this SSD at only $10 higher than it’s sister 1TB notebook form factor SSD. To say that there are more than a few mSATA SSD storage based notebook owners that have been waiting for some time for exactly this type of capacity is an understatement; Lenovo Thinkpad sales surpassed the 60 million mark some time ago."

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