Is the Last Record Preservative system a worthwhile investment?


I take great care in my record collection.
1. I have a manual record vacuum cleaning machine. I also use an enzyme cleaner on a few really dirty ones.
2. I replace all paper sleeves with plastic ones.
3. I use groove glide on only the records in really bad shape. Around 1 percent.
4. I use a record jacket to protect the covers.
5. I meticulously keep the stylus clean.
6. Use a brush everytime I play a record.
  My question being is; will the Last system actually improve the sonics even after all the care I put in to my collection?
How much time is involved treating a record? How much per record does it cost if I buy the larger treatment kits? Id like to hear your experiences with this product. I have close to 3000 records. My analogy is like a great movie that I have never seen. Wow you just now saw that? Will I have an aha moment using the Last system like oh wow, I should have seen that movie years ago. Lol
128x128blueranger
Yes, can be a touch quieter too with some pressings. I also suggest MA Recordings inner sleeves.
And if you use tape deck treat the heads with LAST head treatment before each play. Not substitute for head cleaning of course but a complement. I do it and there is virtually no head wear after thousands of hours of play. I do use best tape and clean the playback head after every 15 hours of play.
Perhaps it was a case of user error . . . 

but many, many years ago I tried the stuff on quite a few records and found, after time, that they sounded worse (clicks, pops, etc. that were *not* present when the records were treated).

I've stayed away from that stuff and for years have relied on my Loricraft and proven cleaning fluids.  Very happy with that arrangement.
I use ultrasonic cleaning, and find no significant difference between 'Lasted' records and just plain clean ones.

That said, the improvement of 80KHz ultrasound over VPI was night and day.
The problem as I see it is this: anyone who applies Last to a record is (by definition) someone who cares for their records. In other words, that person is an audiophile and will likely be very careful about cleaning, etc. So, how can you separate that truism from the potential benefits of Last? Having noted that, I've used it for decades and I really can't tell if it helps or not