Katadyn makes some good products. I have never used that one, but am sure it will serve you well, and do what you want it to do. However, I will recommend another filter. Since you haven't bought it yet, it won't hurt to look at alternatives.

Here are some specs I pulled up for the Vario:
weight: 1 lb 2 oz
pore size: 0.3 micron (the smaller the better)
cartridge life : 500 gallons. 200 liters for carbon
price: $95
filter element replacement price: $45

Here are some specs for the Sawyer Squeeze/all in one
weight: Squeeze-3 oz, all in one-10 oz
pore size: 0.1 micron
cartridge life: there is a million gallon guarantee, but with good backflushing, it should last indefinitely.
Price: Squeeze- $60, all in one-$70.
filter element replacement price: n/a
The all in one is the same as the squeeze, with more attachments. You do have to figure in the price of another bag, since their bags suck. A platypus or equivalent work great.

Anyways, like I said, the Katadyn is a great product. But, there might be better options out there for you to look at.