Egg White Protein Powder

Has anyone ever tried this before? I'm curious if it is any good, it has such a high level of protein and very low carbs. My only concern is the sodium content. Basically it's pretty much 90% Egg whites in powder form.

Here's the stats on one I was looking at:
.......................Per Serve.................Per 100g
ENERGY...............580 kJ ....................1450 kJ
PROTEIN..............32.0 grams..............80.0 grams
FAT, TOTAL..........0.4 grams................1.0 grams
SATURATES..........0.4 grams...............1.0 grams
CARBOHYDRATES.2.0 grams...............5.0 grams
SUGARS...............1.5 grams...............3.8 grams
Sodium..................664 mg ............... 1660 mg


I'm thinking of giving it a go, will let you know how it goes!