Before I got my Typhon III, I bought water from a Glacier machine. They maintain it about every 2 weeks and they leave a sticker on it saying when it was last serviced.
Naturally, I thought it was crap and I bought my RO/DI with a TDS Meter.
Guess what, the Glacier water tested out at 001 and my RO/DI is 000. That said, the water out of my tap is only 070; so, I don't think the Glacier machine in my area has to work that hard to do it's job. The Glacier also uses UV if I remember right.
Before I used the Glacier machine, I used to waste gas and bridge toll to drive to Nippon to buy what I thought was RO/DI water (well it wasn't).
While my Glacier machine was good, nothing beats the convenience of making your own.
Best of luck,
Roy