TRV4 alternatives

[fronty]

Can someone recommend an alternative to the Drayton TRV4 radstat? I have about 10 in my house but over the past few years 2 of them have failed, on one the base of the head which contains the screw thread just cracked and disintegrated and could no longer be screwed onto the body, and I have another one now that is leaking out from the body and will need to be replaced, I'm a little disappointed if I'm honest (20% failure rate), so can someone recommend something better? There's so many on the market I have no idea what's good and what's crap. Thanks.