Hafler preamps - good, not so good, and history?

I recently bought a used Hafler Iris preamp and I must say it is a welcome addition to my system. Right away I noticed how transparent, musical and non-fatiguing this preamp is. As stated in the owners manual, it seems to have achieved its goal of combining the best characteristics of tubes and solid state. I have no qualms about this preamp and the price was a steal for such quality. F.R. Ps: I've never enjoyed analog more. The Iris's phono section is amazing!

I still have and use my Hafler DH-101 Pre, with a couple of XL-280 Power amps and a cheap, 20W per channel power amp, this is for a tri-amplified system. After much tweaking the original circuits of the Haflers (selecting every resistor and capacitor to match the other channel ones), I found a very good ACTIVE type Crossover, 3 way, 24 dB/Oct Linkwitz-Riley which printed circuit boards are sold by a genius designer from Australia. Please let me tell all you good Hafler-loving people, that with a tri-amplified system, your OLD but good Haflers are ALL you are going to need forever. There is NO need to use an extremely expensive modern amplifier or magic tube setup, the real weak point in any system is the passive crossovers at the speakers. With an active, correcly aligned crossover, the drivers will be perfectly driven by the old Haflers. Transparency, control, authority and lively but not fatiging sound is easily produced at high levels without needing an extremely powerful, expensive amplifier.
Good Luck, and our prayers to David Hafler, a truly extraordinaire and honest designer that allowed us to reach high quality audio at honest prices and without esoteric false premises.

I have had a Hafler preamp, amps (DH... & DH...), and I loved the sound, but would never buy a Hafler preamp now.
After a short period (1 year and on), every Hafler preamp in my circle of friends ( 3 or 4 of us) developed noisy, damn near explosive switching.
If you forgot to turn the volume down when engaging the various switches, you would be reminded in a noisy, kaboom, pick your adjective kind of way.
In my somewhat limited opinion, they had good sound, but lousy switches, pots, etc.

I guess I should also add that I owned the Adcom 565, and it had none of the issues I talked about regarding the Hafler preamps. I recently sold the 565 and at 14 years old, still had no switch or other noise.

Does anyone else have any thoughts on Hafler preamps? I keep trying to acquire a DH-110 at a reasonable price but keep striking out. The Hafler Iris has caught my eye though but am curious what other members think about it. I love Hafler amps though. I currently have a rebuilt Hafler DH-220 and it sounds great. I had a DH 500 and a pair of XL280s and they sounded good as well. My favorite though is still the DH-220.