If you think the Technics SL-1200 and SP-25 mats are God awful please send all of them my way and I'll gladly pay the postage. Technics wasn't cutting any corners or penny pinching and the mats were well designed to function with each model table Technics mfg. Yes I'v seen some well worn mats that were used 24/7/365 on broadcast turntables but any decently cared for Technics turntable the mat should be in excellent shape even after 30+ years. As noted by another poster aftermarket mats were sometimes used in conjunction with the original mat to adjust the VTA height of a non adjustable VTA tonearm. All the aftermarket mats I'v tried have not made any significant SQ improvement. Unless your into it for eye candy save your money for something like a stylus/cartridge upgrade, record cleaning machine etc. I'v read numerous threads/posts on AK Turntables but missed this one re spreading wood glue on the platter and then spraying the platter with Scrubbing Bubbles before playing a record. I'd love to hear the explanation as to what this accomplishes.
I have been around sl-1200's for well over a decade and have seen my friends do surgery on every part of it. Over that time I have come to the conclusion that technics skimped on the platter. Technics def. cut some corners or the table would be $100k not $500. Looking at the table it has a very nice motor and controls ($125), a nice plinth with decent feet ($125), a decent sounding easy to use tone arm ($100), nice bearing ($35), and nice accessories and packaging ($100). On a $500 table that does not leave much for the platter, only $15 and I don't think technics spent much more than that. The platter is unbalanced, rings like a bell, super light, and when compare to other TT makers like micro, jvc, denon, pioneer etc. pretty much across the board have nicer platters.
If you think that micro, jvc, denon, pioneer, etc. did not skimp either you would be wrong. Most of their plinths looked nice but that is about it. Even the gigantic and tremendous gt2000 has a so-so plinth.
The technics mat is just a cheap piece of rubber. You can diy one for a few bucks. The h.a.l., b.h., f.f. mats I mentioned earlier are not that. Mats are also more than just an s.q. improvement, it helps with micro slippage that the technics mat suffers from. Did you know a kab fluid damper does nothing to improve the s.q.? All it does is act as the ultimate record de-warper. Still lots of record weights, clamps, and suction mats that cost more and do not do as an effective job as the kab so it's worth the $149 and kevin can not keep them in stock...no s.q. improvement.
In the end this is a firkin, at least on the used side, a $50 upgrade and a potential loss of only $20. The only upgrade that might be cheaper is the headshell which technics actually put some time and effort into imo. You know how much money I have spent in restocking fees and selling used for a loss trying out different audio gears? More like $2k not $20.