I had the pleasure of side by side testing Tak150 and AP155. We pushed both telescopes to insane magnifications...about 1200x if memory serves. The Tak got a little touchy...in that the airy disk wasn't perfectly circular and showed a minuscule bit lateral colour.
The AP remained, well perfect, we couldn't fault it....but a sample of one, from each manufacturer, I freely admit was statistically insignificant.
I however much prefer AP's simple and robust approach to accessories/adapters. Tak literally have adapters for adapters...and they are dammed expensive.
My advice...if you ever see an AP refractor come up for sale, grab it!
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