It didn’t start well — Gmail sent my coveted early invite to Google+ to spam as a potential phishing attack. So what to think of it after just a few days? Tech prognostication is always iffy — it’s very hard to guess what will actually capture people’s attention over time, once the gloss rubs off. But Google+ is smooth, fast and intuitive — a product that feels far more akin to the revolution that was Gmail than to its less successful iniatives like Wave and Knol.