I had the LPS installed in my G68XXD last month. Total cost was $1400.00, including a recalibration of my room. Sound is very similar to the switching supply, but maybe a little cleaner in the mid and high frequencies. Really hard to tell though, because I had no issues with the original unit. In any case, the sound is magnificent - particularly with good sources, (Blu-Ray discs, etc.)

The switching supply is a little larger than a pack of cigarettes. The new linear supply is much BIGGER - the toroidal transformer alone is probably 3" in diameter and sits vertically, which may be why the G61/65 cabinet is a tighter fit.

#1 G65, UHD722, Oppo UHD-205, BAT VK6200, Vandy Quatro, VCC5, VSM1, Swarm, Pass XP-25, VPI HW-19 Mk. 4, FR64fx, Koetsu Urushi, SOTA, MDC-800, Miyajima Shilabe, BS Node 2i
#2 AC200, M6, BS Node 2i
#3 DIY Tube Pre, Pass FW J2, Alesis ML9600, BS Node 2i, Direct DAC, PassDIY Pearl 2, Denon DP-70, Ort. SPU, Spendor SP-1, Magnepan LRS, VPE LDW, Pass SLOB