I just purchased an iStar Phantom FCL 140mm (5.51") f/6.5 refractor telescope this month, April 2022. I'm so glad I did!
I am getting older, and I can no longer comfortably lift and mount a traditional f/12 refractor of this aperture. The iStar Phantom 140mm telescope is shorter, lighter, and much easier to mount, and offers me even larger aperture than I had before (old telescope was a 127mm f/12).
The Phantom's super apochromatic corrected lens is a delight to view through. I enjoy studying the moon. On lunar images, the contrast and detail are astounding. I tried several of my orthoscopic eyepieces, and saw no limit to details my eyes could discern. So just for fun, I used a 2x Barlow and my shortest 4mm orthoscopic eyepiece (Magnification = 2* 910/4 = 455x). The image was still clear to the finest details. It seemed unbelievable. Also one of the first things I noticed right from the beginning of viewing, was the colour purity of the image compared to my old telescope. It just was so refreshingly pure. I can't describe it better with any other adjective.
The spring weather in southern Ontario has not been night sky friendly, and seeing conditions had lots of turbulence, 3-4 out of 10 is how I rated the atmosphere. I managed to
take a quick image through this telescope with eyepiece projection to my cheap grainy webcam. It is a screen capture on a laptop limited to 1366x768 pixels, no filters, no processing, just a single frame shot. You can see there are details in the shadow of the crater still wanting to be pulled out by a better image capture device. When viewing directly with eyes, there seems to be no breakdown of the image no matter what eyepiece I used!
The build quality and finish of the telescope are first class. The fact that it is shorter and lighter than traditional achromatic refractors, has a double mount that can be used as a carrying handle for us older astronomers, yet offers a super apochromatic corrected lens at a price that is lowest on the market for this aperture of telescope, makes it the best telescope value on the market as far as I'm concerned.