No ads, less functionality and a track record of feeding customers BS support claims. I've subbed for one year just to give them a chance but every fibre of my being is against this.To people complaining about subscription pricing:
Access to the new Twitter API costs money. The developer has to pay for it. Subscriptions are the only way a third party Twitter client is possible.
Think of it as paying for no ads on Twitter. It's only $6 a year; I bet some of ya'll spend that at Starbucks every day.