Bought new in Europe for $100
My best IEMs, very good analytic sounding, obviously not for bass-head even though my favorite headphones are Denon D2000!
High isolation but might be uncomfortable (it goes deep in ear canal)
I had RE-0 as well, to me HF5 are much better, they are not bass anemic like Hifiman's
I still do not know how to evaluate the price, they are MANY newcomers in the market such as JVC FX series or VSonic which can be bought for less than $100.
If you need very strong isolation, don't look elsewhere!

I had SR225, MS1i & this SR60i
In Europe, MS1i probably have the best ratio price/performance but still they are not Grado.
I love its unique vintage design even though it looks cheap. 
Grado sr60i are very good sounding, to me they are  perfect for rock/metal music but not only.
They are comfortable , light,but soundstage is very small for such an open headphones.
SR225 was better but was not night & day versus SR60i so price difference in Europe is not justified.
Newcomers, I would advice you to buy Grado 2nd hands here on Head fi, you'll get a SR225i for the price of a 80i new or 325i for the price of a SR125i in Europe.
Grado's are unique and I think everyone should have one in its collection
 

Old timer which is still the best.
I love its dynamic sound but can brings fatigue after some hours.
Every things is there :bass, mids & highs with good details.
Every parts can be changed to make sure it will last long,
The only complaints I have : it doesn't fold 
 
I think it is still the best on-the-go headphones
 

I like it so much. Sold once but bought a 2nd times few weeks later.
Very capable headphones, easily mod'able to perform even better.
Full sound with very good bass response, slightly recesses mids and good highs. Good soundstage for a closed headphones but light isolation.
Very comfortable, well built (never had issue)
Will never sell it (discontinued)
Buy it while you can!

So so good headphones for the price, same as Denon D1001 which was 2/3 times more expensive.
Needs to break in to sound at its best.Will give you a flavor of Denon D2000 sounds.
Unbelievable value; Highly recommanded