Those who only just have sluggish boxes should possibly check the batteries in their remote. It's such a small thing but potentially could make a huge difference to the experience.
We've just bought a second hand T1050 for the in-laws via TradeMe which I've been evaluating before I install it for them. They've recently canceled Sky and have opted for the Freeview/Netflix combo. I found the box to be pretty bad when I first got it going. Many remote buttons were pretty dicey and some just didn't get a response. Ran a meter across the supplied batteries which were shot, replaced with fresh ones and most of the dicey buttons came back to life and appeared to make the box much more perkier.
As the labels on a few buttons had worn off we were probably going to get a new remote for it so figured I had nothing to loose so last night prised the remote open, doused the circuit board in CO cleaner and it's now working 100% (if you squint to read what some of the buttons are).
Sure that particular box isn't a rocket ship and the hardware is made to a price but from what I saw their well spec'd MySky box wasn't all that responsive after Sky's new firmware update either.
i don't even use the stock remote but same issue generally speaking. recordings locking up is my only burning issue , a well known one