Beta tester for some time, if you have it set up properly it will not use as much memory as most believe. Always close it out when finished and don't set it to Go to backround on close, select no...
I've used viigo and all the betas for over a year..
Love it.
Like SD said, as long as you close it when you're done with it, it's no worse than any other app..
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I run Viigo all the time. It runs just fine on my AT&T Bold running EastAsia .216. I even have it save all on exit, and updates every 2 hours. It gets a bad reputation because of supposed "memory leaks" (which isn't even a leak actually), but since it's perfectly fine on mine, it's a keeper. I have a ton of blogs on it =)
I love viigo, use it several times a day! The new version just released is really cool, gives you movie times, stocks, facebook notifications, the list goes on. This is one of the best out there and I have been using viigo for a long time now and never had any problems or memory leaks with it!