Should i buy this phone?

no

i doubt any smartphones can resist shock from falling, but it depends on the height of the drop and the landing material(wood, carpet, etc).
Defy is a pretty old model, do you have any other option, if so post them here.
I use a HTC Sensation which I'm overall satisfied for what i paid for it.

Get a flip phone or a phone that can slide on or off, those are cool phones.

JCB Pro Smart, Huawei U8510 Ideos X3, Samsung Galaxy S4 LTE GT-i9505G Google Play Edition 16GB, Samsung Galaxy Xcover GT-S5690, Samsung Galaxy Xcover II GT-S7710, CAT B10, CAT B15

If you're worried about breaking your phone, see if you can get a good rugged case for it, like the ones reviewed here (outdated, but the first link I could find).

'cause really, there's no smartphone I know of that can survive more than a few impacts. Mind you, a good case can be pretty expensive.

I own the original DEFY. Far as durability goes it's a good choice, but it's a weak smartphone with an old OS (though you can install many custom ROMs on it). In my experience it occasionally got stuck and people complained about noise when I talked to them. It's possible that the DEFY+ solves some of these problems, but it still won't be a match for newer phones.

Still, I like smaller phones and I haven't found anything better than the DEFY. I eventually moved back to a Nokia candybar phone.

Nope, get a better one! >_<

get an galaxy s2
i owned it for almost 2 years and i still use it (i am writing this comment through it)
battery life vanished few months ago
it survived many impacts trust me on pavement with no covers
s3 would have been killed by then

Jiayu. No need to thank me.

Nokia Lumia 520....

Samsung Rugby II SGH-A847

As far as this goes, you can always try Lenovo A660.
Or just get a normal one and a case. My SGS3 got dropped quite a few times but since it has a screen protection and a decent case - it's k.