I've used both and the Last is a great product. My turntable uses a felt mat and the static from it is problematic though. The record generally lifts the mat on removal from the platter. Then I need to peel the mat off the record and put it back on the platter. The Gruv Glide solves this problem. I've found that the absolute barest application provides all the benefits and I don't hear any degradation in my system. I also don't experience the gunk build up on the stylus that is often referred to. Of course, it's modest by Audiogon standards and I'd be foolish to think it would pick up the subtle nuances of a system like Alberts. I have tried two other mats previously that degraded the sound IMO. Simply put, the music lost whatever it is that makes my toe tap or my foot keep time with the music. I've own a Zero Stat and used it religiously until I discovered Gruv Glide. It saves a lot of time (especially when I have a listening partner) and I experience no ill effects from its use. YMMV and all that. A little science never hurts.
In this corner Groove Glide...
and the challenger is Last's record preservative. I have not tried gg, but there seems to be some discussion of a post cleaning step yea or nea. I use Last on all used records and nothing on new ones. Thus far happy with reduced noise and no back of the hall reduction in intimacy from those just cleaned but nothing extra. But I could be wrong. What say ye?