My BFF rode one into Grand Prairie last week from HOU... and it was AWFUL!!
No one helped her load her 2 bags, ENORMOUS car seat and 18mo-old. She had a helluva time getting all that on and off by herself. And the bus was an hour late picking them up in HOU, and then got LOST here in Downtown Dallas (waaaaay far from GPrarie), and the driver pulled into a liquor store parking lot in a very scary part of town, then got OFF the bus to call dispatch and ask for directions. She said that several passengers finally had to navigate the driver to the station. So they were like 3 hours late arriving, all told.
Sure she paid like $6 total, but was scared sh$tless most of the time. Could've flown Southwest for like $75.
So... is it cheap, yes. Would I do it, NEVER by myself, or with a kiddo.