Buying SSD to my Macbook Pro M2012

1.5 million hours (if I read that right) is A LOT of time. For schoolwork, an SSD will last just fine, you shouldn't have any issues with too many writes.

By the way, the "too many writes" thing is an estimated number of writes PER CELL, not overall on the drive.

If you enable TRIM (Google it), you could put almost as much as you want on the drive. Many drives these days actually include a buffer of sorts so there are spare segments to take up when it marks one as "bad".

Modern SSDs are very durable. Everything can break, but the SSD should last the life of your laptop if not more.

The slowness of SSDs comes from Apple not supporting TRIM on non-Apple SSDs. TRIM helps keep your SSD fast and works on Windows and official Apple SSDs. There is a simple hack for forcing Apple to use TRIM on other SSDs. This link is for the most popular app.

SSD performance is great and it only slows down when you fill the drive to 100%. My drive still runs well at 90% full. You don't need to keep it half full.

I had a corsair 128gb SSD that died after a month. Luckily I bought the extended store warranty.

I have a crucial 128gb that is going strong for a few years now. And my Macbook has the apple SSD that has been perfect so far.

So the reliability is about the same as hard drives.