1. Shared packages are WAY WAY oversold - 400G bandwidth? Try using all that without ever going over 1% CPU Usage. I have a little store, about 15 orders a day, and I exceeded that limit in 10 days, having only used 13GB of bandwidth.
2. They will disable your site without warning should you exceed that undisclosed CPU limit, send you a brief email in broken english basically saying that if you want your site back, you need to upgrade to a dedicated plan at $100+ per month.
3. If you're foolish enough to fall for that, like I did, you better have a sixth sense about servers - as in, your IP address appeared to you in a dream. The IP addresses in the welcome email were wrong. 2 days later that's fixed. The nameservers in the welcome email were wrong, nothing resolved correctly. 2 more days of headache. Need an SSL cert. 5 more days of headache. Oh, you can't send emails from your email client because you can only STMP through port 25, and your ISP probably blocks that - so many places (think Hotmail) will bounce your emails. And so forth, and so forth. Blech, blech, blech.
Transfered to a different host after 3 months - paying $14 a month for a shared account and no problems! Don't want to see anyone go through what we did!