Generally I'd say it's not worth trying to adapt an FD lens for the EF mount. The reason for this is that the EF mount has a larger registration distance, that is distance from the sensor the mount so that any simple FD to EF adaptor will act like an extension tube and you wont be able to focus beyond a few meters!

Canon produced an adaptor with a glass element which corrected focus distance but increased focal length by a factor of 1.1, could only be used with telephotos and decreased optical quality. This adaptor was mainly produced to placate those with a significant investment in long Canon glass and is quite rare. This is probably the reason people consider this type of adaptor to be "tripe". There are also third party versions of this adaptor which are comparable to the Canon one (i.e. still not that good).

However, as the lens in question is a macro lens, you could use a simple mechanical adaptor and the result would be a decrease in minimum focus distance, increasing magnification. So if you plan to use this lens for macro work then you should be able to adapt it no problem, however it wont be useful for anything else. A glassless adaptor wont compromise the optics so this is probably responsible for the mixed opinions on adaptors.

At the very least you need an adaptor with that can engage the aperture lever so you can stop down (almost essential for macro work) I think most of the glass ones do this, if you can't find a mechanical adaptor which will work the aperture for you, you can remove the glass from one of the other adaptors.

Incidentally, that 50 f/1.8 is well worth the price so I would leave it on the shopping list even if you keep the macro, for when you can afford it.