Being a Dealer for Ikon Suspension and Gazi shocks I usually ask the riders weight and intended use i.e. pillion passenger/extra luggage etc.and make a recommendation based on the info supplied? never be sensitive about saying your true weight, or that of your partner regardless of being fat or skinny
There is nothing wrong with Ikon shocks or the technology they use? We use them on the DAM racer and finished 2nd in the State championships in 2013 and third in 2014 so they can't be all bad, and, no business lasts for more than 30 years with a poor performing product.
What they don't have is adjustable compression damping, which on most accounts will get you into more trouble than you've already got because of a poor choice of spring. There are better spec /more expensive shocks for racing but I like to back our product and they are Australian Made.
Ikon give you the choice of chrome, black or aluminium body, with or without spring covers, chrome or black springs, skinny or barrelled springs, linear or progressive rate springs to cater for a wide range of loads. They are perfect match for the style of the 70's and 80's bikes. Pics here:
http://www.thedam.com.au/The_DAM/DAM_Laverda_Ikon_shocks.html
They are the only shock absorber Made In Australia with the strict quality control that is demanded in this country and for around or under AUD $400 is amazing value. Frankly I don't know how they do it for the price! they are rebuildable and parts are readily available if you wanted to have a go yourself but like a lot of things better to go new anyway.
DAM Racing ships worldwide often at prices better than you get by going direct to Ikon.
Gazi make good shocks too, a comparable set to the Ikon 7610 series will cost you RRP $690 or you can get modern looking Upside Down Piggy-Back style with adjustable compression and rebound rate for RRP $780. They are all aluminium bodied, some versions are hard anodised. I believe there is a choice of springs although it's not listed and hasn't been made available to me at this stage.
These shock are made in Taiwan. Once again, being a Dealer for Gazi I can supply worldwide often at a better price than you can buy direct from the Gazi Website.
http://www.thedam.com.au/The_DAM/DAM_Laverda_GAZI_shocks.html
If you want to spend more money there are plenty of other manufacturers, it's horses for courses.
Get the correct springs for your weight / intended use, be meticulous in the setup and you'll be very happy?, they want you to be happy because its a very competitive market out there.