Extremely overpriced for what they offer. I guess they are good for absolute web novices who want to run WordPress but way better prices are offered with far more disk space and bandwidth than Siteground offers. Customer services is good which is why I gave them 2 stars but their fees are beyond a joke and all the add ons are completely unnecessary (and often a pain in the A) for seasoned professionals. Shop around and read independent reviews (e.g. PC Mag recently reviewed the best server hosts and SiteGround didn't rate a mention). Bottom line though, PROs good for newbies and WP newbies, good customer services and good servers and uptime (albeit very little disk space when compared to many other companies). Cons extremely overpriced for what they offer.
