Florist roses are bred for volume (fast rebloom), long vase life, endurance during shipping, usually but not always big blooms, etc. They are grown in greenhouses or in climate that is favorable to this kind of roses. Most have no fragrance at all and may or may not be graceful shrubs in the garden.

Many people like or want to try florist roses in their garden because they are good for cutting. I do have 10 or maybe 15 florist roses in my rose beds. I didn't find them very difficult to grow, at least not more difficult than the average hybrid teas. Lately breeders hybridize florist roses aimed at garden use. Kordes has a series called "Freelander HTs", florist roses for garden use. Tantau also markets a number of florist roses that are sold for gardeners.
Augusta Louise, Black Baccara, Black Magic, Ice girl, Osiana, Red Intuition, Tineke, Valencia are some of the florist roses I grow. Augusta Louise is new, planted this winter, so I don't know how she will perform but this rose is reported to have very strong fragrance, so I wanted to try it. Ice girl is also new and should be fragrant. Tineke is my best white rose; neither thrips nor botrytis attacks it so it is a wonder for me in my climate.

Of the florist roses I grow, only Black Magic proved to be a disappointment but almost everybody else will praise this rose, so it looks like that it's me or my soil that cannot make this rose happy. But I discarded a few florist roses that were troublesome and a few died on me. I don't see much difference between a regular HT and a florist rose in terms of care.

There are also floribundas with small, frilly blooms that are used in the florist trade. As Mike R. noted in your thread about Garnette, most of these are collectively referred to as "Sweetheart Roses" (not to be confused with the variety Cécile Brunner, which is also known as The Sweetheart Rose).

I have a few HTs that are used in the florist trade. There was a vendor, Carlton, who sold these plants to the public, but they are no longer in business. K&M Nursery has some of them, but they graft on Fornuniana rootstock, which is not hardy here. There are some popular varieties, as ceterum noted, that are a little easier to get.

Steve in Wisconsin also has a few florist roses and he grafts on multiflora.

More often than not, Florist roses do not perform as well in the garden as they do under the special condition where they are grown. Many times the flower size or color do not even look the same especially in cooler climates.

Karl is absolutely right (isn't he always - you just gotta love that guy!). But once in a while, a florest rose will be a good garden performer. My favorite is Virginia - I bought it from Carlton when they were still in business, because I have an elderly neighbor named Virginia and I like to give her a bouquet of 'her' roses every once in a while. Here's Virginia:

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Karen, you keep teasing me with your gorgeous Virginia, a rose that isn't available any more. Sooner or later I will ask cuttings from you. I apologize in advance. :-((

I wish that Deborah were still around, the queen of florist roses. She had more than 100 florist roses and they performed spectacularly in her garden

I loved Carlton's and sure wish they would come back! Knowing they will not, I have taken it upon myself to root florist roses I find locally.

Papaya:
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Black Beauty:
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Latin Lady:
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That Black Beauty is stunning! It does not even look real. Gotta find that down here. Any suggestions?

I too have Virginia. She is own root. But her stems are or were floppy last year. Her blooms are lovely though aren't they? I got mine from Donny (roseland nursery).
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Looking a little ragged after a hard rain
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Tammy

Tammy, your Virginia will get much larger canes as she matures. Mine puts out lovely thick canes now and really holds those heavy blooms nicely.

I really like that Virginia Karen & Tammy. Oh how I miss Carltons!