New Experiementalist - MGX or Helix?

Although I've had anal sex with women and the idea of giving it to them does do it for me, I've obviously never been on the receiving end. Whilst I've had a little limited play around as far as I can reach I'd like to give this a proper try and try and experience new intense orgasms. Is the Aneros Helix just like a newer better designed MGX?
What would you recommend to guarantee awesome pleasure for someone new to this? Would either do the trick? Which is easiest to achieve orgasmic goals? Whilst I want something that works easily I don't want to get something to intimidating as I have noticed small things feel much bigger when in your behind!

How do you use it BTW? Is it more for clenching as it doesn't seem easy to grip?

What accessories are essential? Cleaning, Best lube etc? I don't think I can be bothered with an ass cleaner.

Also what is the best/cheapest online supplier in the UK?

Is it still possible to get the 90 day refund guarantee when in the UK and how would this work - do you have a UK base?

Thanks