Even out of the box, I wouldn't characterize the SL12x0 series as "thin" unless there's a cartridge mismatch or bad setup. Murky, yes, but thin? I don't think so. The most significant sonic shortcomings of the SL12x0 TTs are minor and cheaply remedied. You just have to know whtat to do: Get an LpGear ZuPreme headshell, get the fluid damper for the tonearm, wrap the tonearm in teflon pipe thread tape, toss the stock footers and replace them with Vibrapod Cones and Isolators, get a better mat, and platform the table on a thick maple butcher block cutting board. Do these and the murkiness disappears and you find it an overachiever in inner detail.
I regularly visit a local Rega and British-heavy dealer and often hear the upper end Rega tables with great setups and excellent downstream electronics (e.g., Naim), and also the nicer Roksan tables. I have *never* returned home from one of those sessions to play my SL1210 M5G (with all the tweaks mentioned above) and wished I had a better rig or setup. "Thin" never came into the equation. The Technics trumped them in propulsive tempo and lack of stylus drag on heavily modulated passages (e.g., orchestral crescendos). I'll grant you that the soundstage is usually narrow, but the depth is excellent and imaging is pretty good.
I regularly visit a local Rega and British-heavy dealer and often hear the upper end Rega tables with great setups and excellent downstream electronics (e.g., Naim), and also the nicer Roksan tables. I have *never* returned home from one of those sessions to play my SL1210 M5G (with all the tweaks mentioned above) and wished I had a better rig or setup. "Thin" never came into the equation. The Technics trumped them in propulsive tempo and lack of stylus drag on heavily modulated passages (e.g., orchestral crescendos). I'll grant you that the soundstage is usually narrow, but the depth is excellent and imaging is pretty good.