They're not bad - I've used them once or twice. I keep then in my rawlplug box for use in situations where I reckoned a rawlplug would work OK, but then find it hasn't! Does depend on how crappy your walls are though - if they're really bad, these things won't work miracles, and you'd be better off with a more rigourous method like a resin-based system.
But anbyway, they only cost a quid or so from B&Q or Wickes: hardly going to break the bank if they don't grip well enough!!
Get some foam glue and just bang a few nails in to keep the batton in place. Mark the wall level or plumb, run the glue along the line, put the baton in place and nail it home. The nails should stop the glue from pushing it off.
When the foam has set, cut the excess off with a sharp blade. If you are bothered about markng the wood use some tape to protect it and go sparingly with the glue. You really don't need much.
Interestingly Wet'n'Fix didnt start life as a Fischer Product... it was the creation of "Monarch International" an odd collection of an IT Consultant, a Prosthetics expert and a Wine purchaser for a large chain. Nice guys though.
Like most one-product startups they struggled to get traction until Fischer negotiated to rebrand the product. Once Fischer did have the rights they didnt do much with it for a ling time. It looked like they were burying the product until Monarch went bust or decided not to play anymore.
I've not spoken to them in a a couple of years, but it does seem like things are picking up for them, but then they have been plugging away for 7~8 years.
For the record, they do work very well - which is probably why the guys have stayed the course - when you have a product that works well that you can believe in, it does keep you focussed...
Bought some from Wickes (=A32.99 for 20 iirc) and initial results seem promising. They seem to do exactly what it says on the packet. Time will tell how they perform over time.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.