Just an update on this after having a few weeks trying out the new sanding discs on my Makita RO sander.
Discs tested:
Toolpak standard hook and loop @ £2.49 10pcs - price when purchased
Sianet 7900 net backed @ £12.56 50pcs - price when purchased
3M Cubitron Xtract net backed @ £16.73 50pcs - price when purchased
Mirka Abranet (standard) net backed @ £27.90 50pcs - price when purchased
All discs were tested 125mm in 120 and 240 grit variants.
All tested on pine furniture board and a mix of kiln dried oak and ash wood.
Conclusion.
4th place (as expected) - Toolpak cheapo discs from toolstation.
Categorically the worst. A super cheap but would probably be my choice if I were doing a one off job and just needed maybe half an hour worth of sanding and were happy to use most of the pack. The discs wear out super quickly but if only needed for a quick diy job, I'd buy a pack of 10 and forget about the sub £3 cost. The dust extraction on these discs was also the worst out of all 4 tested discs.
3rd place - 3M Cubitron Xtract 710W
A decent disc but the 240 grit really seemed to wear out much quicker than I would have hoped. Easily the quickest wear of all the discs bar the toolpak. Extraction on this disc was on par with the other three net back discs as I had expected, if not a little better. The price of these discs - 34pence per disc also made these great value compared to the Abranet discs which came in @ 56pence per disc. The 120 grit discs lasted better than the 240grit discs but still not as long as the Mirka Abranet but at least as long as the Sianet 7900s (120 grit). Overall, third place as these discs surprised me with how fast they wore down - most specifically in 240 grit - but they're a close second place and would be happy to use these discs again. The overall quality of these discs was very good though.
2nd place - Sianet 7900
These discs surprised me the most. At 25pence per disc, these were by far the best value discs of the bunch. On both Oak and pine, these discs lasted well and even after they were slightly worn from the RO sander, they continued to feel like they were doing a decent job when used as a hand sanding pad for a final hand pass. I'm not sure these discs are much better quality than the 3M Cubitron discs, but they definitely were the surprise of the bunch and were the best value discs in my eyes. The only slight native was that the edges of the disc seemed to fray and become tired looking a bit sooner than the other two net backed discs. The dust extraction was pretty much on par with the 3M and Mirka discs. I would be very interested to try the Sianet 7500 "ceramic" discs @ 30pence per disc which offer even better abrasive performance than the 7900 range and are still (slightly) cheaper than the 3M Cubitron discs.
1st place - Mirka Abranet (standard grade)
Of all the discs tested, the Abranet slightly outlasted the other discs especially on the hardwoods. The dust extraction was maybe marginally better than the Sianet discs (which were near on just as good...) and probably on par with the 3M discs. I would buy these discs again but due to the 56pence per disc cost, these wouldn't be my first choice unless I had a business that was really chasing back every last minute of the sanding process and didn't mind spending more than double the cost of the Sianet discs. All in all, a top grade disc as you would expect, but you are made to pay the premium over some other pretty capable discs at much more affordable, and competitive prices.
Overall, the winner for me personally, is the Sianet disc. These discs @ £12.56 a box (for 50) really are the best value discs out of the ones I tested and definitely deserve praise for what they achieve at their price point. The Mirka discs only win because they were the "best" discs, although they really should be at the price and I wouldn't say they were twice the disc of the Sianet, or even, the Sianet were only half as good, because they're not. The only reason I can't place the Sianet discs as first place overall is because in my (very unscientific) test, they did seem to get to a point where once the abrasive material started to wear, it totally removed itself from the net backing and once it started to go, the wear patch seemed to spread rapidly and leave you with a smooth piece of netting with no abrasive. The other discs seemed to fail in a way where the grits turned to much higher # grits rather than the grit fall off totally.
So as promised, my review and honest, unbiased feedback of all the above discs. Coming from a place of ever only using cheap eBay/amazon/toolstation discs, I will be progressing my woodworking career using the Sianet discs for as long as I can grab them at their current price.
I hope someone considering upping their sanding game as I have been recently, will find this review helpful.
Cheers.