I have a small account with Marketspreads. And I like them. I'm not doing anything real risky or exciting trading wise, and they've never did me any wrongs. I'm long term long on shares, not using any leverage, and i'm not being charged any daily financing costs.
My only concern is their association with Worldspreads. Even though they've distanced themselves from Worldspreads, there could be reputational damage to Marketspreads which were once Worldspreads in Ireland. But I hope not.
I have an account with a large UK spread betting company as well and I much prefer Marketspreads.